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From the liner notes

The story of a South Bronx apartment building taken hostage by a gang of crazed, junkie punks. After witnessing the miscreants shooting up heroin and lunching on rats they killed with loaded 357s, apartment dweller Hector gets fed up and turns in the band of basement squatting junkies. The police arrest them, but justice does not prevail. A few hours after their release the gang returns with only one thing in mind, revenge! Their plan is simple; take over the builing, terrorize, maim, torture and kill every tenant, one floor at a time.