"Friend" is an abuser

[RoundandSad]

Bear with if some of this is a jumble I am shocked.
I just found out that someone in our lovely local friend group has a conviction for domestic violence and was in jail before we met him

I can't help thinking that domestic violence has to be very serious to warrant Prison sentence and all the information might not be in the online report. It looks awful and it might be worse than it looks.

I don't know what to do. I don't know if everyone else knows. He is related to the person I would describe as the queen bee of the group so she definitely knows - she must know.

I don't want to lose close friends but I am really shocked and I don't know what to do. Should I tell other women in the group?

Well, it isn't hidden information. So I would just avoid him, but continue socialising with the group. If he starts dating someone else, pass it on. If anyone notices that you're not talking to him, tell them why. If you have any particular friends and felt the need to talk about it, tell them. It isn't hidden, it is in the public domain. "Allowed into the group" implies there is some kind of authority deciding who gets to join your friends...which would be an unusual set up.