There's also the fact that they were slaves. The plantations that the revolution collectivized are the same plantations that generations of Cubans were enslaved on and after emancipation, their ancestors were tied to by enclosure laws that forbid movement and poor wages.

Even people with ancestors who owned plantations in Cuba would call the workers on their land slaves or at least indentured servants. Because there wasn't really any authority that was gonna do anything about you not paying them or mistreating them.