This chapter focuses on the law as it affects the running of a trade union. All the relevant law is consolidated by the Trade Union and Labour Relations (Consolidation) Act 1992, as amended. The discussions cover the definition of a trade union, their listing, and certification; the rules of a trade union including disciplinary action and conduct of union affairs; the executive committee, election of candidates to the executive committee; rules for accounts, records, etc; the requirements before a trade union can have a political fund and pursue political objects; breach of union rules; amalgamation and transfers; and employers’ associations.