dirty money

noun2

1. •
   Money that is illegally gained, illegally transferred or illegally utilized, especially money gained through forgery, bribery, prostitution, money laundering, or theft.

   • Corruption is a force multiplier for the West's enemies, and yet the West continues to accept dirty money into its economies by the billion. — 2018
2. •
   (informal) Extra money paid to workers as compensation for dirty or dangerous work.

   • The days should be long gone when workers are paid dirty money to do a risky job […] — 1997