FBI Planned Mass Arrests in 1950

Former FBI director J Edgar Hoover had a plan to arrest 12,000 Americans he deemed a possible threat to national security, declassified papers reveal. The FBI chief sent his proposal to US President Harry Truman just after the start of the Korean War in 1950. He asked the president to declare the mass arrest necessary to counter treason, espionage and sabotage. There is no evidence any part of the plan was ever approved