... a Spanish-language song originating during the Spanish Civil War of 1936–1939, and is usually attributed to the anarchist CNT-FAI, a prominent labour organization at the time which sent its own militias to fight alongside the Spanish Republican Army ...

In the square of my village
the laborer said to the master:
"Our children will be born
with their fists raised!"

And this land, which isn't mine,
this land which is the master's
I water it with my sweat
and work it with my hands.

But tell me, comrade,
if these lands belong to the master,
Why do we never see him
working with the plow? ...

https://en.wikipedia.org/wiki/En_la_Plaza_de_mi_Pueblo