The fourth season of the American television drama series "Sons of Anarchy" premiered on September 6, 2011 and concluded on December 6, 2011 after 14 episodes aired, on cable network FX. Created by Kurt Sutter about the lives of a close-knit outlaw motorcycle club operating in Charming, a fictional town in California's Central Valley. The show centers on protagonist Jackson "Jax" Teller (Charlie Hunnam), the then–vice president of the club, who begins questioning the club and himself.

It is the longest season of "Sons of Anarchy" and the only season to have 14 episodes, as every other season had 13 episodes. The season premiere ("Out") was written by series creator and executive producer Kurt Sutter and was one of the highest-rated telecasts in FX's history.

"Sons of Anarchy" is the story of the Teller-Morrow family of Charming, California, as well as the other members of Sons of Anarchy Motorcycle Club, Redwood Original (SAMCRO), their families, various Charming townspeople, allied and rival gangs, associates, and law agencies that undermine or support SAMCRO's legal and illegal enterprises.

More Info: en.wikipedia.org