Diego Abad de Santillán

Sinesio Baudillo García Fernández (20 May 1897 – 18 October 1983), commonly known by his pseudonym Diego Abad de Santillán, was a Spanish Argentine anarcho-syndicalist economist. Born in León, his family moved to Argentina while he was young. He returned to Spain for his higher education and became involved in the Spanish anarchist movement. After his studies, he went back to Argentina and became involved with the Argentine Regional Workers' Federation (FORA), co-founding the International Workers' Association (IWA).