Amalgamated Society of Boilermakers, Shipwrights, Blacksmiths and Structural Workers
The Amalgamated Society of Boilermakers, Shipwrights, Blacksmiths and Structural Workers (ASB) was a trade union in the United Kingdom. Many of its members worked in shipbuilding, in which industry it was the leading trade union, while over time it also developed strength in engineering and construction.