What are the names of the two rival street gangs in "West Side Story"?

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Shakespeare's "Romeo and Juliet" has been brought to the stage and screen countless times, but dropping the feuding families into 1950s Manhattan as rival street gangs was something else entirely. "West Side Story" became a landmark Broadway musical in 1957, then a massive Oscar-winning film in 1961, and even got a fresh remake in 2021. The whole story hinges on two gangs fighting for control of the Upper West Side neighborhood. What are the names of those two rival gangs?



