Robert Oppenhiemer's career was destroyed because of his views. In the 30's
and 40's he had views favoring Communism, which would make him a Democrat
today, and because of these views and associations he had his clearance
taken away.

http://capitalcentury.com/1953.html

I also have seen employees of a defense contractor lose their jobs because
they supported Kerry over Bush when asked by management. Can't happen? Check
out "at-will" employment.

http://en.wikipedia.org/wiki/At-will_employment

At least they weren't killed or detained for their views unlike dissenters
at Bush rallies:

http://www.aclu.org/freespeech/prote...s20030923.html