This is the anthem of the Organisation of Solidarity with the People of Asia, Africa, and Latin America (OSPAAAL), also known as the Tricontinental. The Tricontinental is a Cuban organisation that was founded at the Tricontinental Conference in Havana in 1966. It currently publishes a magazine by the same name and used to produce records as well, of which I have only been able to find two. This recording is from one of those records.
Singer: Choir of the Workers of Holguín (Coro de los Trabajadores de Holguín) Year recorded: 1974 Year written: 1966 Source: Vinyl Record "Himnos De Lucha" Picture: Cover of a pamphlet from the Tricontinental Congress in 1966