Mostly harmless stuff like running out the Dixie Mafia when they setup up porn shops or illegal gambling dens. He spent 3 years under cover in the KKK and helped ruin their credibility in the Central Alabama area.
And then some questionable stuff like breaking into a Nation of Islam church and spending multiple days camped out in their attic until he was able to take photos of the leader of that church engaging in extra marital affairs with the wives of church members. He used those photos to cause quite a bit of mayhem and violence amongst the church members until the church was no more.
But his most interesting story is when he claims to have discovered (I have never been able to verify this like I have the other stories) that the Moonies from Europe had their passports withheld and then those passports were sent to Korea in order to get their operatives into the country.
I have no idea if that was true, but every single time we saw someone selling a flower somewhere he would share that story.