Ecclesiastes 4: 13
"Better a poor but wise youth than an old but foolish king who no longer knows how to take warning. The youth may have come from prison to the kingship, or he may have been born in poverty in the kingdom. I saw that all who lived and walked under the sun followed the youth…"  

Yes, there are leaders in prison that can return to their neighborhoods and lead many to a relationship with Christ.  By attending a regular Bible study while in prison the return rate of inmates drops from 78% to around 20%.   God is in the business of transforming hearts and minds through His word.