Full of black rats trapped,
The projects dehumanize their inhabitants; they are packed together as tightly as rats, and society seems to value their lives no more highly than vermin. The “projects” were, of course, a kind of social experiment in housing policy, with blacks serving as “lab rats” being experimented on by social engineers.
This could also be an allusion to opening scene of the novel “Native Son” by Richard Wright. The main character Bigger Thomas traps and kills a black rat. The situation turns out to be a metaphor for his own fate.
Following the previous line, the “black rats” could be cocaine addicts, whose lives are trapped in the maze-like block of coke.
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