Author Upton Sinclair picketing the Rockefeller Building in 1914.
Upton is probably best known for his book The Jungle. But he was very active politically as well. He even ran for office in California but was never elected.
Time magazine called him "a man with every gift except humor and silence." I don't know about humor but he was involved in plenty of protest throughout his life. I can't find a reference to why he was picketing in 1914, but he is in the white suit with the black armband.
Photo courtesy of the Library of Congress, Bain Collection.
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