<Table> <Tr> <Td> </Td> <Td> This article's plot summary may be too long or excessively detailed . Please help improve it by removing unnecessary details and making it more concise . (September 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article's plot summary may be too long or excessively detailed . Please help improve it by removing unnecessary details and making it more concise . (September 2017) (Learn how and when to remove this template message) </Td> </Tr> <P> In the slum neighborhood of Five Points, Manhattan in 1846, two rival gangs have engaged in a final battle in Paradise Square over "who holds sway over the five points"; the two gangs participating in this event are the nativist, Protestantism group, the "Natives", led by William "Bill the Butcher" Cutting, and the Irish Catholic immigrant group, the "Dead Rabbits", led by "Priest" Vallon . By the end of this battle, Bill kills Vallon and declares the Dead Rabbits outlawed . Having witnessed this, Vallon's young son hides the knife that killed his father and is taken to an orphanage on Blackwell's Island . </P> <P> Sixteen years later, Vallon's son, who is actually named as Amsterdam, returns to Five Points seeking revenge and retrieves the knife . An old acquaintance, Johnny Sirocco, familiarizes him with the local clans of gangs and thieves, all of whom pay tribute to Bill, who controls the neighborhood . Amsterdam is finally introduced to Bill, but keeps his past a secret, seeking to be recruited . He learns that many of his father's former loyalists are now in Bill's employ . Each year, Bill celebrates the anniversary of his victory over the Dead Rabbits; Amsterdam plans to assassinate him during this celebration . </P>

What is the theme of gangs of new york