Question

attorney-general a. mitchell palmer conducted a series of raids.... the most spectacular of the palmer raids occurred in january 1920. - start-up of the department and world war i, 1913 - 1921, u.s. department of labor, www.dol.gov (accessed november 21, 2013) what was the primary reason for the raids described in this excerpt? to prevent workers from joining labor unions to block civil rights activists from staging public protests to suppress the teaching of evolution in colleges to halt the spread of communist ideas by radicals

Explanation:

The Palmer Raids were a series of raids conducted by the United States Department of Justice to capture, arrest, and deport radical leftists, especially anarchists and communists. The raids were a response to the Red Scare, a fear of communist revolution in the United States.

Answer:

to halt the spread of communist ideas by radicals