What Is a Trade Union? Recognition, Strikes, and How the Rules Differ by Country

A trade union is an organisation of workers that bargains collectively with an employer over pay, hours and working conditions. If you searched what is a trade union and landed on a page describing ballot thresholds or recognition elections, the most useful next question is which country's law that page was describing. The answer changes completely between the United States, the United Kingdom and India, and almost no page that ranks for this term says which one it means.

That is the gap this guide fills. It answers the definition first, then labels the jurisdiction, because the vocabulary and the law come apart. Fabric builds AI-led first-round interviews for teams hiring at volume, and this page sits in our labor law and workplace compliance coverage as background for hiring and recruiting teams.

One note before the detail. This is a politically contested subject, and nothing below argues for or against unions. It reports what the statutes and the official statistics say, and where the law is unsettled or varies by state, it says so.

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Table of Contents

What is a trade union?

A trade union is an organisation of workers formed to negotiate with an employer collectively, rather than leaving every employee to bargain alone. Its core business is terms and conditions: pay, hours, holiday, pensions, safety, and the procedures that govern discipline and dismissal. A union also represents individual members in grievance and disciplinary hearings, and in most countries it can organise industrial action when negotiation stalls.

The word carries geography with it. "Trade union" is the standard term in the United Kingdom and India. "Labor union" is the American equivalent, and the two describe the same kind of body operating under entirely different statutes. Treating them as synonyms is correct as vocabulary and misleading as law, because none of the rules travel with the word.

Membership is voluntary in all three countries covered here. Almost everything that happens after workers join, though, depends on which legal system they are in.

Trade union vs labor union: same body, different statute

The three systems this guide covers rest on three separate pieces of legislation. In the United States, private-sector union activity runs on the National Labor Relations Act, administered by the National Labor Relations Board. In the United Kingdom, it runs on the Trade Union and Labour Relations (Consolidation) Act 1992, substantially amended by the Employment Rights Act 2025. In India, it now runs on the Industrial Relations Code, 2020, which came into force on 21 November 2025.

Density differs as sharply as the law. The US Bureau of Labor Statistics reported a union membership rate of 10.0 percent for 2025, covering 14.7 million workers, with 11.2 percent of workers covered by a union contract. The UK figure is roughly double: 22.4 percent of UK employees were union members in 2025, about 6.6 million people, and the public sector sat at 48.5 percent against 12.1 percent in the private sector.

How to define a trade unionist

A trade unionist is a member of a trade union. In ordinary usage the term usually implies an active member: someone who holds a lay office, acts as a workplace representative, or organises on the union's behalf, rather than someone who simply pays subscriptions.

Neither sense is a legal category on its own. What matters legally is the specific protection attached to the activity. In the United States, for example, the NLRA protects concerted activity by employees whether or not a union exists at the workplace, so the protection follows the conduct rather than the membership card.

The four types of trade union

Union structures are usually sorted into four families, and the categories describe who a union will admit rather than what powers it holds. The distinction matters operationally because it predicts how many unions an employer may end up facing at one site, and whether a bargaining unit will follow occupational lines or site lines.

The four types are:

Craft unions, organised around a single skilled trade or occupation, admitting members who do that work regardless of employer or industry.
Industrial unions, organised around an industry, admitting everyone who works in it from the shop floor to the office regardless of occupation.
General unions, which admit workers across many industries and occupations, often including lower-paid and less easily organised work.
White-collar and professional unions, organised around salaried, technical or professional staff, including teaching, healthcare and public administration.

These are analytical categories, not watertight ones. Decades of mergers mean many of the largest unions now span several of them, and a single employer may deal with a craft union and a general union in the same building.

How union recognition works in the US, UK and India

Recognition is the step that converts a union from an organisation some employees belong to into a counterparty the employer has a legal duty to negotiate with. Before recognition, an employer generally has no obligation to bargain. After it, refusing to bargain in good faith is itself unlawful. This is the single most consequential concept in the subject, and it is the one the ranking pages skip.

Every system offers two paths: a voluntary one, where the employer simply agrees, and a statutory one, where a public body decides after testing the level of worker support. What differs is the threshold, the tribunal, and whether the test is a headcount of members or a ballot of the workforce. The comparison below sets the three side by side.

Jurisdiction	Governing law	Route to recognition	Threshold that matters
United States (private sector)	National Labor Relations Act, administered by the NLRB	Voluntary recognition on a showing of majority support, or an NLRB-supervised secret-ballot election	30 percent showing of interest to petition for an election; a majority of valid votes cast to be certified
United Kingdom	Schedule A1, Trade Union and Labour Relations (Consolidation) Act 1992, as amended	Voluntary agreement, or application to the Central Arbitration Committee	At least 10 percent of the bargaining unit in membership for the application to be admissible; scheme does not apply below 21 workers
India	Industrial Relations Code, 2020, in force from 21 November 2025	Sole negotiating union by membership, or a negotiating council where no union clears the bar	51 percent membership for sole negotiating union; 20 percent membership to sit on a negotiating council

United States: election or voluntary recognition

A union seeking certification files a petition with an NLRB regional office supported by a showing of interest from at least 30 percent of the proposed unit. If a genuine question of representation exists, the NLRB conducts a secret-ballot election, and the union must win a majority of the valid votes cast to be certified.

An employer can also recognise a union voluntarily, typically after being shown signed authorisation cards from a majority. The NLRB treats voluntary recognition as protected from challenge for a reasonable period, which the Board defines as no less than six months and no more than one year from the first bargaining session.

United Kingdom: the CAC route, changed in April 2026

Where an employer will not agree voluntarily, a union can apply to the Central Arbitration Committee. For the application to be admissible, at least 10 percent of the workers in the bargaining unit must belong to the union, and the statutory scheme does not apply where the employer and any associated employers together employ fewer than 21 workers.

Two elements of that test changed on 6 April 2026. Under the Employment Rights Act 2025 changes, a union no longer has to show at the application stage that a majority of the bargaining unit would be likely to favour recognition, and where recognition is decided by ballot it now turns on a simple majority of votes cast, with the former 40 percent support requirement removed.

India: negotiating union and negotiating council

India replaced its older framework when the Industrial Relations Code, 2020 commenced on 21 November 2025. The Code gives statutory recognition a clear arithmetic. According to the Government of India factsheet on the Code, a union with 51 percent membership in an establishment is the sole negotiating union with exclusive rights in collective bargaining and grievance redressal.

Where no union reaches 51 percent, a negotiating council is constituted instead, made up of representatives of every union holding at least 20 percent membership. For a multi-union site, that is the practical difference: one counterparty above the threshold, a committee of them below it.

Read how collective bargaining agreements actually work

What is a strike, and what makes one lawful

A strike is a concerted stoppage of work by a group of employees to press a demand on their employer. The definition sounds simple and the legal consequences are not, because in every system covered here a strike is lawful only if its purpose, its timing and the conduct of the strikers all stay inside statutory limits. Miss one of the three and the protection can fall away.

Two variables do most of the work. The first is procedure: whether a ballot is required, what majority it needs, how long the mandate lasts, and how much notice the employer must receive. The second is the object of the strike, since action aimed at a party other than the employer, or at something the employer cannot lawfully concede, tends to lose protection regardless of how clean the procedure was.

Jurisdiction	Ballot requirement	Notice to the employer	Notable limits
United States (private sector)	No statutory public ballot; internal union rules apply	No general requirement, but 10 days' written notice is required before action at a health care institution under section 8(g)	Sit-down, partial and intermittent strikes are unprotected; secondary boycotts are restricted
United Kingdom	Statutory postal ballot required; mandate lasts 12 months for ballots opened on or after 18 February 2026	10 days, reduced from 14 on 18 February 2026	40 percent support threshold in important public services removed; picketing supervisor requirement removed
India	No statutory ballot; notice is the operative control	14 days' prior notice, now required in all establishments rather than public utilities only	Strikes restricted during conciliation or tribunal proceedings; mass casual leave can count as a strike

The forms industrial action takes

Not every strike is a full walkout, and the label attached to the action often decides whether it is protected. The recurring forms are:

All-out or indefinite strikes, a complete stoppage with no announced end date.
Time-limited strikes, a stoppage for a fixed period such as a single day or a defined series of days.
Intermittent or rolling strikes, repeated short stoppages designed to disrupt without a sustained loss of pay.
Partial strikes and go-slows, where employees stay at work but withhold part of their normal output or refuse specific duties.
Sit-down or occupation strikes, where employees stop work but remain on the employer's premises.
Action short of a strike, such as an overtime ban or a work-to-rule.

India's Industrial Relations Code adds a form that catches employers by surprise: the Government of India factsheet confirms the definition of a strike was amended to bring mass casual leave within it, covering cases where casual leave is taken by more than half the workers on a given day.

Protected and unprotected strikes in the United States

US law sorts lawful strikers into two classes with different reinstatement rights. As the NLRB explains, employees striking to win an economic concession such as higher pay or shorter hours are economic strikers: they keep their employee status and cannot be discharged, but they can be permanently replaced in certain circumstances. Employees striking to protest an employer's unfair labour practice can be neither discharged nor permanently replaced.

Some strikes fall outside protection entirely. The NLRB lists sit-down strikes, partial strikes such as slowdowns, and intermittent strikes as unprotected, and employees taking part in them can lawfully be fired. Protection therefore depends on the object of the strike, its timing, and the strikers' conduct, and none of those is a formality.

What changed in the United Kingdom in February 2026

The Employment Rights Act 2025 rewrote several of the procedural gates on 18 February 2026, and the GOV.UK transition guidance sets out which provision did what. Section 69 removed the 40 percent support threshold that applied to ballots in important public services. Section 72 extended the mandate won by a successful ballot from six months to twelve. Section 74 cut the notice a union must give an employer from 14 days to 10, and section 75 removed the requirement to appoint a picketing supervisor.

The transitional detail matters for anyone reading a live dispute. The 12-month mandate applies only to ballots opened on or after 18 February 2026, and six-month mandates from earlier ballots were not extended automatically, so a union wanting the longer mandate had to re-ballot.

Where the collective bargaining agreement fits

A collective bargaining agreement, or CBA, is the contract that recognition eventually produces. It is the output of the relationship rather than the relationship itself: recognition establishes who bargains, the negotiation produces the agreement, and the agreement then governs pay, hours, benefits, discipline and grievance handling for the bargaining unit as a whole.

Keeping the two ideas separate helps, because they fail in different ways. A recognition dispute is about whether the employer has to talk to the union at all. A CBA dispute is about what the signed document means and how it is administered. The first is decided by a labour board, a committee or a ballot. The second is usually decided by the grievance and arbitration machinery written into the contract.

The mechanics of the agreement itself, the four-stage bargaining process, and how a CBA interacts with non-competes and arbitration clauses are covered in depth in our guide to non-competes, arbitration and collective bargaining. This page stops at the point the agreement is signed.

What union recognition changes for hiring teams

Recognition changes the inputs to a hiring process before it changes anything else. Where a bargaining unit is covered by an agreement, pay for roles inside that unit is set by the agreement rather than by a hiring manager's budget, so a requisition has to be posted at the negotiated rate and against the negotiated grade. Job design follows the same logic, since the agreement often defines which duties belong to which classification.

Three practical consequences show up most often for recruiting teams:

Scope. Whether a specific role sits inside or outside the bargaining unit is a question of fact that determines which terms apply, and getting it wrong is a compliance problem rather than a preference.
Sequencing. Agreements frequently contain internal posting, transfer or seniority provisions that run before external recruitment can start.
Notice. Where an agreement covers headcount changes, contractual notice and consultation steps apply on their own timetable.

None of this is a reason to avoid hiring into unionised sites, and it is not an argument about whether unions are desirable. It is a statement about where the constraints sit, so recruiting plans are built against the real timetable. The rules differ by country, by state and by sector, and the terms of a particular agreement override any general description of them.

Where Fabric fits

Fabric is an AI interview platform. It connects to LinkedIn Jobs, an existing ATS, or uploaded candidate profiles, screens resumes, filters candidates on eligibility parameters such as budget, location and years of experience, and runs an AI-led Round 1 interview across tech and non-tech roles. Cheating detection is built into the product as a core part of it rather than as an add-on.

The honest connection between Fabric and this topic is narrow. Fabric does not administer agreements, track recognition status, or handle industrial relations obligations, and nothing here should be read as a way around them. What it does is absorb first-round screening volume in bulk and campus hiring, which is where enterprises say screening consumes roughly 80 percent of time-to-hire.

Fabric's eligibility screening and technical-depth scoring are designed to flag candidates against the criteria your team sets and surface the result to your recruiter. It is a signal for your team to weigh, not an automatic reject. Where a role sits inside a bargaining unit, the terms that role must be hired against still come from the agreement and from your own legal and HR review.

Screening should not eat 80% of your time-to-hire

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*This article is for informational purposes only. Fabric's Interview Engine screens, scores, and records Round 1 interviews; it does not make the final hiring decision. The recruiter or hiring panel using Fabric remains responsible for all hiring decisions.*

This guide is general information, not legal advice. Trade union, recognition and industrial action law differs by country, by state and by sector, and it changed materially in both the UK and India within the last year. Confirm any specific position with employment counsel qualified in the relevant jurisdiction.

FAQ

What is a simple definition of a trade union?

A trade union is an organisation of workers that bargains collectively with an employer over pay, hours and working conditions. In the United States the same kind of body is normally called a labor union.

What does a trade union do?

A trade union negotiates terms and conditions for a defined group of workers, represents individual members in grievance and disciplinary matters, and can organise industrial action where the law allows it. Its bargaining role only becomes a legal duty on the employer once the union is recognised.

What are the 4 types of unions?

The four types usually named are craft unions, industrial unions, general unions and white-collar or professional unions. Many large unions today are the product of mergers and span more than one category.

Are trade unions a good or bad thing?

That is a political question and this guide does not take a side on it. The BLS reported that in 2025 US union members had median usual weekly earnings of $1,404 against $1,174 for non-union workers, while cautioning that the comparison does not control for occupation, industry, age, firm size or geographic region.

What is a trade union and its purpose?

A trade union is a workers' organisation whose purpose is to improve and defend its members' terms of employment through collective negotiation instead of individual bargaining. Recognition is what turns that purpose into an enforceable obligation on the employer.

What is a trade union in business?

In a business context a trade union is the counterparty an employer negotiates with over pay and conditions for a defined group of employees, called the bargaining unit. Whether the employer has to negotiate at all depends on whether the union has been recognised under that country's rules.

What Is a Trade Union? Recognition and Strikes Explained