From the Wikipedia page 
The Iron, Steel and Wood Barge Builders and Helpers Association was a trade union in the United Kingdom. It was founded in 1872 as the Barge Builders Trade Union, also known as the River Thames Barge Builders Trade Union, and adopted this title in 1940. Its initial membership was about 90 and rose to 400 by 1890. The General Secretary from 1879 to 1908 was William Charles Steadman. The Association merged with the Transport and General Workers' Union in 1973.