ratissage

noun2

1. •
   A raid (especially violent) carried out by the police or military, originally and chiefly carried out by the French in Algeria. and, prior to that, by the Milice (Vichy Government counter-terror police) in 1943-44.

   • The army […] subjected suspect Muslim villages to systematic ratissage – literally a ‘raking-over’, a time-honoured word for ‘pacifying’ operations. — 1977
2. •
   A monetary device whereby national reserves are temporarily given up to a central bank.