protection racket
noun [ C ] uk/prəˈtek.ʃən ˌræk.ɪt/ us/prəˈtek.ʃən ˌræk.ɪt/
（犯罪行为）收取保护费
a criminal system of taking money from people in exchange for agreeing not to hurt them or damage their property
The gang ran illegal casinos, brothels, and protection rackets. 这一帮派经营非法赌场和妓院，还收保护费。