The Federation, consisting of four guilds, was founded in 1921. The guilds were divided into postal sorters, telephonists, counter clerks' telegraphists and sorting clerks' telegraphists. A split occurred in the Federation in 1930 which resulted in the withdrawal of the Postmaster-General's recognition of the union. As a result it soon collapsed through lack of support.
Reference: Alan Clinton, 'Post Office Workers: a trade union and social history' (London, 1984).