It lets police target people who are for the violent overthrow of the government.
I guess you probably thought that McCarthy was a nut when he saw communists in Hollywood.
The pamphlet incudes "defenders of the constitution" as terrorist suspects, even though all military and police take a sworn oath to do just that.
What does that have to do with Joe McCarthy and the communists in the 1950s?
Try to make sense, you are incoherent.