Federal documents show James McLean, Demario Hasty and Lokheim Campbell have all signed plea agreements with federal authorities.
Last August, federal authorities charged seven men who are believed to be a part of the "Down West Boys" gang.
Earlier this month, one of those men, Patrick Broughton reached a plea agreement with authorities.
No word on when he, or the three others who've chosen to plead, will be sentenced.
They seven were charged in a 23-count indictment for several major crimes including shootings, robberies and drug dealing that police say have been going on since 2004.
The Marlboro County Sheriff's Office is assisting in this investigation.
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