The 'Gang of Four'... that's who.
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GANG of
FOUR
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1) Lee Harvey Oswald
Head scumbag
Aka Alek Hidell/O.H. Lee/Dirty Harvey
2) Alek Hidell
In charge of armament procurement
3) O.H. Lee
In charge of safe-house procurement
4) Dirty Harvey*
In charge of killing poor dumb cops
*
Dirty Harry
"Smith, Wesson... and me"
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Dirty Harvey
Smith, Wesson.. and Lee billchapman