Well, this kind of says it all:

As Digby mentioned, the tale of Iran forcing Jews, et al to wear distinctive clothing or badges is apparently false. It seems to have been concocted by American rightwing propagandists and has no basis in fact.

On the other hand, Operation Red Scare, in which the Santa Rosa Junior College Republicans posted Red Stars on the doors of professors they identified as advocating communism is true.

Live links at the post for both.