Federales is a slang term in English and Spanish languages referring to security forces, particularly those of the federal government of Mexico.
The term gained widespread usage by English speakers due to being popularized by films as The Wild Bunch, The Treasure of the Sierra Madre, Blue Streak, the television drama series Breaking Bad and its spinoff prequel Better Call Saul, as well as the song "Pancho and Lefty" by Townes Van Zandt.
Following Díaz's overthrow by rebel forces led by Francisco Madero, the Federal Army remained in existence.
The Federales were eventually disbanded in July and August 1914, after Madero's successor Victoriano Huerta was in turn defeated by an alliance of revolutionary forces.
[1] The formal dissolution of the Federal Army was decreed by the Teoloyucan Treaties, signed on August 13, 1914.