Not so much the hair, but this fellow has got the sideburns down:

http://www.flickr.com/photos/phil_ladouceur/449315195/

Jessica Mitford fought this back in the early seventies when she taught at San Jose State. They refused to pay her unless she signed it, and she let them know they'd be hearing from the ACLU. It's been years since I read her essay about the experience, but as I recall, she won her court case over it, and at that point the law remained on the books but un-enforced.