[1] In 1901, the union participated in a San Francisco strike of over 20,000 men to oppose an open shop initiative by employers.

The strike was unsuccessful, and by the end of the year unlicensed American mariners were being replaced by subsistence-wage foreign crews.

"[2] During negotiations to end the strike, the sailors received concessions such a three-watch system, pay increases, and better living conditions.

In 1936, all the Pacific Maritime Federation unions banded together to strike for wages, working conditions, and a union-controlled hiring hall.

The bas-relief sculpture on the front was made by Olof Carl Malmquist, a sculptor who contributed to the Golden Gate International Exposition.