President Truman on March 21，1947 issued an executive order，initiating a comprehensive investigation of all federal employees.This was the beginning of _______.
A、McCarthyism
B、persecution of federal employees
C、widespread persecution of Communists and progressive people
D、clearing out Soviet spies
【正确答案】：C
【题目解析】：【考点点击】本题主要考查美国反共、排外运动。
【要点透析】1947年3月21日，美国总统杜鲁门颁布一项行政命令，发起对所有联邦委员忠诚性的全面调查。这是普遍害共产主义和进步人士的开端。P217
