What was the impact of the investigations conducted by the Federal Employee Loyalty Program between ...

What was the impact of the investigations conducted by the Federal Employee Loyalty Program between 1947 and 1952?
 
  A) They uncovered evidence of massive subversion and espionage within the Departments of State and Defense.
  B) They restricted their investigations to potential subversives in high-risk areas of government service.
  C) They forced several thousand government employees to resign or withdraw their applications and resulted in the firing of more than 500 people on charges of disloyalty.
  D) They restored to federal government employees a sense of calm and confidence that had been missing since the end of World War II.
  E) They were declared unconstitutional by the Supreme Court.