The Communication Workers Union of Australia is a trade union in Australia. It is a division of the Communications, Electrical and Plumbing Union of Australia. The Union has predominantly covered workers employed by Australia Post and Telstra, but has significantly expanded to cover contractors and workers employed by private sector firms in the postal, logistics, telecommunications and information technologyindustries. The Postal & Telecommunications branches within the CWU had their origins in the Australian Postal & Telecommunications Union. The APTU holds its origins in the Australian Letter Carriers' Association and the Australian Telegraph, Telephone Construction & Maintenance Union which were both registered federally in 1912. In 1924 the Australian Letter Carriers' Association changed its name to the Commonwealth Public ServiceFourth Division Employees' Union of Australia only to amalgamate a year later with the Postal Sorters' Union of Australia and the Australian Postal Linesmen Union of Australia to form the Amalgamated Postal Linesmen Sorters' & Letter Carriers' Union of Australia. From 1926 it was known as the Amalgamated Postal Workers' Union, covering postmen, sorters and linesmen. The APWU served until 1974 when it changed its name to the Australian Postal & Telecommunications Union as a result of a further amalgamation with the Union of Postal Clerks and Telegraphists. From 1990 the Union amalgamated with the Australian Postmasters’ Association and later the Postal Supervisory Officers' Association to eventually be known as the Communication Workers’ Union and later to be joined by the Australian Telecommunications Employees Association/Australian Telephone & Phonogram Officers Association and the Telecommunication Officers Association. By 1994 the CWU had merged with the Electrical Electronic Plumbing & Allied Workers Union of Australia (the end product of a merger between the ETU and the PTEU to form the Communications Electrical Electronic Energy Information Postal Plumbing & Allied Services Union of Australia.