Add a new rule to the ruleset, entitled Gang affiliation:

Each Prisoner may be a member of up to one Gang. Gang membership is tracked in the GNDT. All Prisoners with the same value in the GNDT for their Gang are considered to be part of the same Gang, and may be referred to as each others’ Gang-mates.

Whenever a Prisoner who is a member of a Gang posts a Confession of any kind, but before the Accomplice makes a Statement on that Confession, the Suspect’s Gang-mates may Intimidate the Accomplice of that Confession by making a comment to the Confession that includes an symbol.  If the Accomplice Defects on that Confession then any member of that Gang may, once, increase the Accomplice’s SHIV by 2 per Intimidating Gang-mate, and then Walk the Yard for the Accomplice as if they had done so themselves.