Sailors' Union of the Pacific
The Sailors' Union of the Pacific (SUP), founded on March 6, 1885 in San Francisco, California, is an American labor union of mariners, fishermen and boatmen working aboard US flag vessels. At its fourth meeting in 1885, the fledgling organization adopted the name Coast Sailor's Union and elected George Thompson its first president.
Source: Wikipedia — Sailors' Union of the Pacific (CC BY-SA 4.0)