On the loyalty oath, read Jessica Mitford's piece in the above-mentioned book Poison Penmanship (formerly A Fine Old Conflict) titled "My Short and Happy Life as a Distinguished Professor". The original 1974 article in The Atlantic is linked to below, but PP also includes her followup commentary about what happened afterwards. Well worth the price, sez I.

http://www.theatlantic.com/magazine/archive/1974/10/my-short-and-happy-life-as-a