This isn't a new problem. Between 1950 and 1967, employees of the University of California were required to swear an oath that they were not a member of the Com

This isn't a new problem. Between 1950 and 1967, employees of the University of California were required to swear an oath that they were not a member of the Communist Party. https://en.wikipedia.org/wiki/Levering_Act https://en.wikipedia.org/wiki/Levering_Act