polishing the rock
n.— «According to a recently declassified FBI report on the Aryan Brotherhood, “The rule of thumb is that once on the streets, one must take care of his brothers that are still inside. The penalty for not doing so is death.” This practice is known within the gang as “polishing the rock.”» —“Hate Crimes in Prison” by David Holthouse AlterNet Nov. 21, 2005. (source: Double-Tongued Dictionary)
Further reading
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