The “La única consigna del momento Vencea Vencea En Todos Los Frentes Partido Sindicalista” poster is from the Spanish Civil War. It was published by the Partido Sindicalista or Syndicalist Party. This party were a Catalan left wing party who formed part of the left wing collation that fought against Franco and his right wing party.
The poster depicts a strong boot standing on a snake with a Nazi symbol on its back. The English translation of the text states “The only slogan of the moment is win win in all fronts.” The large white text over the mans leg states the name of the party “The Syndicalist Party”.
Syndicalism is a unique socialist movement that involved having groups of workers owning and managing the means of production.