The National Amalgamated Union of Labour (NAUL), National Union of General Workers (NUGW) and the Municipal Employees' Association (MEA) merged in 1924 to form a new union, named the National Union of General and Municipal Workers (NUGMW). Although the new union was one of the largest in the country it grew relatively slowly over the following decades; this changed in the 1970s when David Basnett created new sections for staff, and hotel and catering workers, and changed the union's name to the General and Municipal Workers' Union (GMWU) in 1974.<ref>Arthur Marsh and John B. Smethurst, Historical Directory of Trade Unions, vol.5, p.486</ref>
In 1982, following a merger with the Amalgamated Society of Boilermakers, Shipwrights, Blacksmiths and Structural Workers (ASBSBSW), the union was renamed the General, Municipal, Boilermakers and Allied Trade Union (GMBATU). This was sometimes shortened to "GMB", which in 1987 became the official name of the union.<ref name="marsh" /> For several years following the highly contested merger boilermaker members retained a distinct identity in GMB's Craft Section.
The union has absorbed the following smaller unions:<ref name="marsh" />
In 1992, the GMB for the first time allocated all of its members to one of eight industrial sections: clothing and textiles; commercial services; construction, furniture and allied; energy and utilities; engineering; food and leisure; process; and public services.<ref name="marsh">Arthur Marsh and John B. Smethurst, Historical Directory of Trade Unions, vol.5, pp.438-440, 486-488</ref>
The GMB's sections were rationalised in 2006, with the union since then consisting of GMB Commercial Services, GMB Manufacturing, and GMB Public Services.<ref>Template:Cite web</ref>
GMB Credit Union
To serve its members with ethical loans and finance and helpful support, GMB launched a standalone credit union offering in 1998.
Founded as Thorne Credit Union after Will Thorne, founder of NUGW forerunner, the National Union of Gas Workers and General Labourers and one of the first LabourMembers of Parliament, the credit union began life as GMB Lancashire Region Credit Union before being rolled out nationwide in 2000.<ref>About TCU Money Thorne Credit Union (retrieved 21 February 2015)</ref> Today, the credit union serves over 10,000 nationwide and growing rapidly.
Template:Main
On 28 October 2016, in a landmark ruling if not overturned on appeal, the Central London Employment Tribunal ruled that Uber drivers are "workers" entitled to the minimum wage, paid holiday, sick leave and other normal worker entitlements, rather than self-employed. Two Uber drivers had brought the case to the employment tribunal with the assistance of the GMB Union on 20 July 2016,<ref name=bbc-20161028>Template:Cite news</ref><ref name=guardian-20161028a>Template:Cite news</ref><ref>Template:Cite report</ref> as a test case on behalf of a group of 19 drivers.<ref name=guardian-20161028b>Template:Cite news</ref> As a consequence, The Pensions Regulator is considering if the ruling obliges Uber to create a workplace pension scheme.<ref name=ft-20161028>Template:Cite news</ref> The ruling could have implications wider than just Uber, throughout the so-called gig economy.<ref name=reuters-20161028>Template:Cite news</ref> On 10 November 2017 the Employment Appeal Tribunal upheld the first tribunal's ruling. Uber indicated that it would appeal further.<ref name=guardian-20171110>Template:Cite news</ref>
The law firm Leigh Day started the legal action against Uber on behalf of 25 members of the GMB union, which initially included J. Farrar and Y. Aslam, although the two pursued this latest case with a different union, the Independent Workers' Union of Great Britain.<ref>Template:Cite news</ref>
Another similar case against parcel delivery company Hermes Group, supported by the GMB through lawyers Leigh Day, had a similar outcome at an employment tribunal in Leeds on 25 June 2018. Hermes are considering an appeal. The GMB stated the ruling was likely to affect 14,500 Hermes couriers.<ref name=guardian-20180625>Template:Cite news</ref> General Secretary, Tim Roache, described it as:
Template:Blockquote
In 1991, GMB was the first British trade union to set up an office in Brussels and has been particularly engaged in seeking to influence European Union legislation that sets minimum standards for workers and for health and safety across the EU single market.
In 2008, GMB Congress voted to withdraw local funding from around a third of the 108 Labour MPs whose constituencies received support from GMB, due to the perception that some MPs within the party were treating workers with "contempt" and generally not working in the interests of the working class and GMB members.<ref>Template:Cite news</ref> Despite this the Congress opposed disaffiliation from the party.
In 2013, GMB Congress, the lay member ruling body, adopted a 14-point plan to encourage GMB members to become active in the Labour Party and to stand as Labour candidates for public office (Parliament and local government). GMB has two representatives on the National Executive Committee (NEC) of the Labour Party, Kathy Abu-Bakir and Gavin Sibthorpe. In Ireland, GMB is affiliated to the Irish Labour Party.<ref>Party structure » Who we are » The Labour PartyTemplate:Webarchive</ref>
The GMB is led by a general secretary and treasurer. In 2005 Paul Kenny was appointed the acting general secretary, in place of Kevin Curran who stepped down after being suspended on full pay during an inquiry into ballot-rigging during the union's leadership election. The episode was seen as a power struggle between the national office and powerful regional heads, led by Kenny, who opposed centralisation. Kenny had lost the 2003 vote to Curran. In May 2006, Kenny was elected unopposed as general secretary.
Tim Roache was elected as general secretary and treasurer in November 2015, receiving 56.7% of the vote on a turnout of 4.2%, beating the one other candidate, Paul McCarthy.<ref>Template:Cite magazine</ref> Roache took up the post in 2016, but resigned in April 2020 after allegations of harassment.<ref>Template:Cite news</ref>
In 2020, following the resignation of general secretary Tim Roache and subsequently receiving anonymous allegations, the union conducted a barrister-led internal inquiry.<ref name=sky-20200429>Template:Cite news</ref> This concluded that bullying, misogyny, cronyism and sexual harassment were "endemic" within the union. More specifically the report stated "The GMB is institutionally sexist. The General Secretaries and all regional secretaries are, and always have been, men. Women are underrepresented throughout the GMB’s ranks", concluding that culture must change for the GMB to become a safe and rewarding place for women.<ref name=belfasttelegraph-20200902>Template:Cite news</ref> The report made 27 recommendations for change, on which the union's National President, Barbara Plant, promised to act.<ref>Template:Cite news</ref><ref>Template:Cite web</ref>
Until May 2011 it sponsored Swindon Town Football Club, but when Paolo Di Canio was appointed manager the GMB terminated the relationship because of Di Canio's political views. A GMB spokesman said: "He has openly voiced support for Mussolini so it beggars belief that Swindon could have appointed him, especially given the multi-ethnic nature of the team and the town."<ref name="stfc">Template:Cite news</ref> The union sponsored Port Vale for the 2013–14 football season.<ref>Template:Cite news</ref>
.jpg){kind=link}