The term 'West Side Story Group' refers to the two rival gangs featured in the classic musical, West Side Story. The two gangs are the 'GANG' and the 'JETS'. The GANG is a Puerto Rican GANG led by Bernardo, while the JETS are a white GANG led by Riff. Both gangs are involved in a turf war over the streets of New York City. The musical follows the story of Tony, a former Jet, and Maria, Bernardo's sister, as they try to bring peace between the two gangs.