True Humans Against Mutant Freaks is a radical group of bigots who violently oppose powered humans.  The origins of the organization date back to the depression of the 1930s when so many people were looking for someone to blame.  THAMF is popular among the disenfranchised.  They are very aggressive and have expanded their message of hate to include extra-terrestrials.
 

q.v. GURPS IST.