Thousands of Cuban doctors work abroad under contracts with the Cuban authorities. Countries like Brazil pay the island’s Communist government millions of dollars every month to provide the medical services, effectively making the doctors Cuba’s most valuable export.

But the doctors get a small cut of that money, and a growing number of them in Brazil have begun to rebel. In the last year, at least 150 Cuban doctors have filed lawsuits in Brazilian courts to challenge the arrangement, demanding to be treated as independent contractors who earn full salaries, not agents of the Cuban state.

“When you leave Cuba for the first time, you discover many things that you had been blind to,” said Yaili Jiménez Gutierrez, one of the doctors who filed suit. “There comes a time when you get tired of being a slave.”