Season four of the hit drama "The Sons of Anarchy" opens to find numerous SAMCRO members being released from prison and getting mixed up with a notorious Mexican drug cartel as an uncompromising new lawman assumes power in Charming, and a cunning US Attorney plants a mole in the club on a mission to take them down for good. Meanwhile, SAMCRO Vice President Jax (Charlie Hunnam) considers retiring to raise a family, and Clay (Ron Perlman) is suspected of playing a role in the death of Jax's late father John Teller (Nicholas Guest). .