Remember that some members of your group may have been offender, victim, or both. Seventy percent of us do something during in our lives that would result in a jail sentence if we were caught. In some alternative forms of justice, victims and perpetrators meet and discuss the crime. Convicted offenders are quickly sent away and kept out of sight, often for years. So knowing what's going on demands some sleuthing.
Many inmates express a feeling of being cut off, buried, when they are in jail.
Consider talking to the chaplain or to a social service worker about holding a discussion with a small group of inmates. Some churches hold regular services inside jail, forming a spiritual community with inmates. Others become pen pals. Consider holding a session of your discussion in a prison. Group members may want to add to the list of purposes or create their own.