Answer: ULTRAS

AnswerCrossword Clue
ULTRASExtremists
ULTRASFanatics
ULTRASRevolutionaries
ULTRASPolitical extremists
ULTRASExtremists.
ULTRASMembers of the lunatic fringe
ULTRASRabid supporters
ultrasthe British code name for intelligence gathered by decrypting German wireless communications enciphered on the Enigma machine during World War II
ultrasgoing beyond what is usual or ordinary; excessive; extreme
ultrasULTRA, an advocate of extreme measures, also ULTRAIST
ultrasextremist, as in politics, religion, fashion, etc.