In 1910, nearly 15 percent of the American population had been born overseas, but by 1960, that portion shrank to only 5.4 percent. Similarly, bureaucrats in the burgeoning national security state kept a variety of radicals from entering and leaving the country. Since World War I, foreign anarchists, Communists, and others—ranging from German spies and saboteurs to Black internationalists—found the gate to the U.S. bolt-locked. Likewise, Americans whom the State Department identified as holding so-called “alien” beliefs were barred from the exits.