On this day, 25 May 1901, the revolutionary anarchist union the Federacion Obrera Argentina (later renamed the FORA) was founded in Argentina at a congress of 27 unions. In October they called their first general strike: https://libcom.org/library/revolutionary-unionism-latin-america-fora-argentina https://www.facebook.com/workingclasshistory/photos/a.296224173896073/1131743160344166/?type=3