The South Side Labour Protection League was a trade union organising dock porters and stevedores in the United Kingdom.
However, the union had increasingly come to focus its attention on stevedores, and when its executive changed the union's name to the "Amalgamated Stevedores' Labour Protection League", this led the remaining dock porters to leave.
[1] Inspired by the London Dock Strike of 1889, the former members of the Labour Protection League formed a new union, the South Side Labour Protection League, led by Harry Quelch.
[1] By 1912, the union's twenty branches included:[3] In later years, the union began admitting members working on the north bank of the Thames, particularly in Poplar, and it therefore shortened its name to the Labour Protection League.
By 1920, it had 5,500 members, and it agreed to take part in the merger which formed the Transport and General Workers' Union in 1922.