For most of its history the union had poor relations with the more radical, left-wing maritime trade unions due to the strong communist influence in these organisations, and was aligned with the right wing of the Labor movement, as represented by the Democratic Labor Party.
[4] Robert James (Bob) Heffron was for a number of years in the 1920s the Secretary of the NSW Branch of the Federated Marine Stewards and Pantrymen's Association, and between 1959 and 1964 was Premier of New South Wales.
[3] Despite a long history of proud independence, the association began to consider amalgamation during the 1980s, as generational change reduced animosity with other maritime trade unions, and changes in the industry, such as automation and a reduction in passenger travel by sea, reduced the membership base.
[2] Amalgamation reduced the cost of running a small organisation, and allowed more concerted action on board ships, where previously up to 8 separate unions could have had coverage on a ship of 40, with each union holding separate meetings.
[2] The greater industrial strength of the new SUA (later to amalgamate with the Waterside Workers' Federation to become the Maritime Union of Australia) led to achievements, including new hiring arrangements which gave greater job security to ships' stewards.