I don’t see the two fists as the same.

The communist fist is pointed up with a star.

The Tea Party fist is slanted and has no star, plus has no muscular definition, as the communist fist has.

Lots of political movements have used fists as their logos - I don’t see this one.

Mind you, I don’t like the tea parties (after the images I saw from the 9/12 rally). But the comparison here of logos does not pan out, IMHO.