Herman Gorter was a Dutch poet and Council Communist theorist. He was a leading member of the Tachtigers, a highly influential group of Dutch writers who worked together in Amsterdam in the 1880s, centered on De Nieuwe Gids.
The Social Democratic Workers' Party was a Dutch socialist political party existing from 1894 to 1946, and a predecessor of the social democratic Labour Party.
A political poster of the SDAP. It reads: The Reds call, strengthen the SDAP
A famous cartoon by Albert Hahn in the socialist paper Het Volk. It reads: "The whole machinery stops, if your mighty hand wills it so"
A political poster of the SDAP by Albert Hahn. It reads: "Sign the People's Petition for Universal Suffrage"