<P> Agent Grad Nicholas (David Rees Snell) is an FBI agent assigned to investigate the SAMCRO's arms trafficking business . He works closely with Assistant U.S. Attorney Lincoln Potter, often by his side during various points in the investigation . The character's name is a reference to FX network executive Nicholas Grad . </P> <P> District Attorney Thyne Patterson (C.C.H. Pounder) is the San Joaquin County District Attorney from Stockton assigned to aggressively address the violence plaguing Charming, specifically from a school shooting resulting in the deaths of four children using a gun acquired from the Sons of Anarchy motorcycle club . To do so, she works with former U.S. Marshal Lee Toric to investigate the Sons . </P> <P> Lincoln "Linc" Potter (Ray McKinnon), who in Season 4, Episode 2 says he is a Modesto, California native, is an eccentric, manipulative assistant U.S. attorney operating out of Charming in Season 4 and the head of a joint agency task force targeting the Sons of Anarchy's arms trafficking business under the Racketeer Influenced and Corrupt Organizations Act, as well as the Real IRA and the Galindo cartel . He rides a motorcycle, dresses like a biker, and somewhat resembles John Teller, which causes Gemma to ask Lincoln if she knows him . Lincoln disapproves of Hale's conflict of interest as both a real estate developer and local government representative, and in the Season 4 finale produces evidence at the Charming city council meeting about Hale's investor that kiboshes Hale's proposed luxury real estate project . </P> <P> Lieutenant Eli Roosevelt (Rockmond Dunbar) is a member of the San Joaquin County Sheriff's Department and the head of Charming's law enforcement following the dissolution of the Charming Police Department . Prior to his assignment in Charming, he spent 15 years in Oakland working as part of an anti-gang task force . In the Season 6 finale, Eli finds Tara's corpse and, while he's chastising Gemma, Juice shoots him dead to protect Gemma . </P>

Who is the main character of sons of anarchy