Which raids searched suspected Communists' houses without search warrants?

The raids that searched suspected Communists' houses without search warrants are known as the Palmer Raids. Conducted in 1919 and 1920 under Attorney General A. Mitchell Palmer, these raids aimed to identify and deport radical leftists and anarchists during the Red Scare. They resulted in the arrest of thousands and were criticized for violating civil liberties and due process. The Palmer Raids exemplified the panic and repression of dissent during that era.