He was caught having whole conversation trees with himself in order to fake participation on the site and set its tone.
Yep... I remember that - the little shit was masquerading as a "concerned anarchist" while using Stalinist tactics to harass their critics off the sub - and then started Raddle essentially to have an entire leftist forum for them to play overlord with.
I abandoned r/anarchism pretty much at that time - arguing with right-wingers is a shit-ton easier than dealing with two-faced imposters like that.
edit: For the record, I feel I have to add that it wasn't actually this useless litle fucker's activity that drove me off r/anarchism - it was my disappointment at the fact that the mods couldn't spot their shitfuckery and come up with a way to deal with it when I've seen other mod teams manage it.