Who led the effort to expose alleged communists within the U.S government? A. President Truman B. President Kennedy C. Senator McCarthy D. General MacArthur

C. Senator McCarthySenator Joseph McCarthy led the effort to expose alleged communists within the U.S. government during the Second Red Scare, a period of intense anti-communist paranoia in the United States from the late 1940s to the late 1950s. His accusations, often lacking evidence, became known as McCarthyism.