What do you call a system that combines slavery with espionage? In Communist Cuba, you call it humanitarian aid. For decades Havana has sent tens of thousands of doctors abroad as a supposed sign of goodwill, only to steal their income and use some as unwilling spies. Fortunately, more nations are rejecting Cuba’s “help.”

After toppling socialist dictator Evo Morales in November, Bolivia expelled more than 700 Cuban doctors, accusing them of fomenting protests demanding Mr. Morales’s return to power. Ecuador moved to evict...