Answer: Modern slavery.
Step-by-step explanation:
Modern slavery happens when someone is kept in forced servitude, forcing someone to work unpaid without letting them leave. It befalls when someone has absolute power over another person and applies violence or the threats to keep that control and exploit them economically, without any payment or any chance to walk away.
Desperate poor people are the most likely to find themselves caught in modern slavery, especially people from developing countries trying to find a better life in more developed countries.