Communism

Serbia, in its first constitution in 1835, declared that any person stepping foot on its soil becomes free. Similarly to how Mexico had plans to decriminalise drugs, this constitution lasted for only 55 days before every feudalistic power in Europe (Ottoman, Russian, Austrian, etc.) managed to take it down for being too revolutionary. Can't have peasants that don't speak french thinking about liberty, equality, and limiting the powers of monarchs...

A couple of centuries later, a crime lord dictator of Serbia allows Chinese Companies to enslave people and bring them to work in their factories, mines, or construction...