Marlon Brando possesses an undeniable magnetism within this ultimately underwhelming story about two motorcycle gangs disrupting a quiet American community. He portrays "Strabler," someone who disdains any form of leadership, arriving with his “Black Rebels” crew. They’re loud and imposing, but not truly threatening – thankfully, because Sheriff "Bleeker" (Robert Keith) seems utterly ineffective. "Strabler" becomes i…