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In 1920, the ASE put out a fresh call for other unions to merge with it in a renamed Amalgamated Engineering Union (AEU). Seventeen unions balloted their members on a possible merger, and nine voted in favour of amalgamation:
The resulting union had a membership of 450,000, about 300,000 coming from the ASE.
In 1922 employers, represented by the Engineering Employers' Federation, launched an industry-wide lockout in an attempt to reverse the gains made by the AEU during WWI and its aftermath. Exploiting the downturn in economic conditions in the engineering industry, they demanded the union forfeit control over overtime. The lockout lasted from 11 March to 13 June and involved 260,000 workers, 90,000 of them represented by the AEU. The lockout ended with the union conceding some of the employers' demands.
The AEU continued to grow and absorb smaller unions. From 1926, it accepted members who had not completed an apprenticeship. In 1933, it had 168,000 members, and 390,900 by the end of the decade. Its largest membership growth came during the Second World War when its all-male membership voted to admit women for the first time and 100,000 joined almost immediately, membership reaching 825,000 by 1943. It admitted women due to the increasing role of female industrial workers in the British home front, as well as to prevent either female workers joining rival unions or non-union female workers from undercutting union wages. However, during World War II the AEU also lost its overseas branches in Australia, New Zealand, and South Africa, which became independent unions.
The AEU merged with the Amalgamated Union of Foundry Workers (AUFW) on 1 January 1968 to form the Amalgamated Union of Engineering and Foundry Workers (AEF), and with the Draughtsmen and Allied Technicians' Association (DATA) and Constructional Engineering Union in 1971 to form the Amalgamated Union of Engineering Workers (AUEW). The union was now organised on a federal basis, with four sections: Engineering, Foundry, Construction, and Technical, Administrative and Supervisory (TASS). This approach was not a success, as the various sections fell into dispute with each other. In 1984, the Engineering, Foundry and Construction Sections were merged and in 1986 adopted the name Amalgamated Engineering Union once more, while the TASS remained separate and, in 1988, it became entirely independent of the union once more.
Despite this series of amalgamations, declines in the number of workers in heavy industry saw membership drop from a peak of 1,483,400 in 1979, to 858,000 in 1986. The AEU became a mainstay of the moderate right in the trade union movement through the 1980s and 1990s, leading the manufacturing unions in 1989–1991 in a successful push for a shorter working week, but failing to merge with a number of unions, notally the Union of Construction, Allied Trades and Technicians.
^ "Appendix III: List of sanctioned candidates, June, 1922". Report of the Twenty-second Annual Conference of the Labour Party: 116–126. 1922.. Note that this list is of the sanctioned candidates as of June 1922, and there were some changes between this date and the general election.
Candidate was listed as sponsored but not attached to any specific constituency in: "By-elections". Candidates and Constituencies: 62–63. 1922.
^ Jefferys, James B. (1970). The Story of the Engineers. Edinburgh: Reprints in Social and Economic History. p. 230.
^ Labour Party, Annual Report of the Labour Party Conference (1928), pp.275–281. Note that this is a list of affiliations of Labour MPs as of September 1928, and it is possible that some MPs held different sponsorship as of the 1924 election.
^ "List of Labour Candidates and Election Results, May 30th, 1929". Report of the Annual Conference of the Labour Party: 24–44. 1929.
"Parliamentary by-elections". Report of the Annual Labour Party Conference: 16–28. 1931.
"List of Endorsed Labour candidates and election results, October 27, 1931". Report of the Annual Labour Party Conference: 11–27. 1931.
^ "List of Endorsed Labour Candidates and Election Results, November 14, 1935". Report of the Annual Conference of the Labour Party: 8–23. 1935.
^ "List of Endorsed Labour Candidates and Election Results, July 26th, 1945". Report of the Annual Conference of the Labour Party: 232–248. 1945.
^ Sponsor assumed to be the same as at the 1950 UK general election
^ "List of Parliamentary Labour candidates and election results, February 23rd, 1950". Report of the Forty-Ninth Annual Conference of the Labour Party: 179–198. 1950.
^ "List of Parliamentary Labour candidates and election results, 25th October, 1951". Report of the Fiftieth Annual Conference of the Labour Party: 184–203. 1951.
^ Labour Party, Report of the Fifty-Fourth Annual Conference of the Labour Party, pp.255-275
^ Labour Party, Report of the Fifty-Eighth Annual Conference of the Labour Party, pp.179-201
^ Labour Party, Report of the Sixty-Third Annual Conference of the Labour Party, pp.158-180
^ Labour Party, Report of the Sixty-Fifth Annual Conference of the Labour Party, pp.308-330
^ Labour Party, Report of the Sixty-Ninth Annual Conference of the Labour Party, pp.289-312
^ Labour Party, Report of the Seventy-Third Annual Conference of the Labour Party, pp.391-411
^ Labour Party, Report of the Seventy-Third Annual Conference of the Labour Party, pp.371-390
^ Labour Party, Report of the Seventy-Eighth Annual Conference of the Labour Party, pp.406-431
^ General Election Guide. BBC Data Publications. 1983. ISBN094635815X.
^ "AEU sponsored MPs show the way in the general election". AEU. 1987.