The Hull Seamen's Union was the oldest and strongest of the local seamen's societies. It was formed as the Hull Seamen's and Marine Firemen's Amalgamated Association in 1887 by the merger of the Hull Sailors' Mutual Association and the Hull Marine Firemen's Mutual Association. It became the Hull Seamen's Union in c.1913 and in 1922 merged into the National Sailors and Firemen's Union.
Reference: Arthur Marsh and Victoria Ryan, 'The seamen. A history of the National Union of Seamen, 1887-1987'. Oxford, 1989.