On July 30, 1934, as the strike came close to conclusion, Lundeberg was elected Sailor's Union of the Pacific patrolman for the Seattle area.

A month later, William Green, president of the American Federation of Labor, took over the ISU with the goal of rebuilding it under the AFL.

[7] On October 15, 1938, at an AFL convention in Houston, Texas, Green handed Lundeberg the Seafarer's International Union charter.

Lundeberg served as president of SIU from 1938 until his death from a heart attack in a San Francisco hospital on January 28, 1957.

[8] In testimony before the Canadian Parliament in 1996, David Broadfoot of the Canadian Merchant Navy Association recalled that in 1946, "Our government imported a thug, a real heavy-duty gangster from Brooklyn (Hal C. Banks), to smash our union and bring in the Seafarers' International Union ... which was no different from the Teamsters at its worst and no different from the longshoremen's association at its worst ...