Margaret Murphy, thanks PsychoPere
, she was band groupie, and into drugs, but wasn't with any bikers. I could see her concern for Tara and tendency to look the other way in an effort to get Tara out of the club as a good intentioned path to ending up in being trapped in helping the club. Unser could have gotten caught up with the club in some similar fashion trying to get Gemma out of that life. Instead, she and Clay use that concern to their ends.
I guess the new character might be Damon Pope, the crime boss mentioned by Eli at the end of last season. I hope we see Danny Trejo' Romero Parada back as well.