【正确答案】正确答案： (1)On Nov. 7, 1919 and Jan. 2, 1920, the Justice Department launched two waves of mass arrests. Over 4, 000 suspected Communists and radicals were arrested and many were forced to leave the United States. (2)On April 15, 1920, Sacco and Vanzetti were arrested on the charge of involvement in a murder and robbery case. They were convicted and sentenced to death. But there was little evidence to prove they were guilty. Strong, wide-spread protests did not save them. They were executed in 1927. People said they died for their radicalism.