Sam Brandon joined the Socialist Labor Party (SLP) as a teenager, and became an organizer for its New York section and chair of its NY State Committee. Political differences led to the expulsion in 1927 of the entire Bronx section. Along with other expellees (including his older brother Joseph), he first formed the Socialist Labor Propaganda League, then the Industrial Union League (IUL) in 1928. In 1933 he founded the Industrial Union Party (IUP), and remained its leader, an advocate of the ideas of SLP founder Daniel De Leon, and a critic of the SLP until his death. Brandon also founded RichLoom, a Brooklyn-based textile manufacturing company, whose profits supported his activism.
From the guide to the Sam Brandon: Daniel De Leonite Socialist Movement Papers, 1900s-1980s (bulk: 1970s-1980s), (Tamiment Library / Wagner Archives)
