Do you by chance know where he lives? I'm not suggesting you do anything but there is a bit of symmetry if you do. In theory you could throw anything back at him that he does to other people's property. Perhaps if he knew people knew where he lives he wouldn't be so bold and you wouldn't have to do any of that. I guess you could flier the neighborhood with who he is, what he looks like, what he's done, and where he lives. Then if anything does happen to him it could be anyone. Everyone knew where he lived. Bonus points if you mention that he's antifa so people recognize antifa equals anti-social. Other people are going to be more likely to do something if they know it won't single them out. In terms of illegal things I'm not advocating but will provide a comprehensive list anyway: Slashing tires, Pouring gorilla glue on hood and windshield requiring replacement Leaning a large garbage bin of water against his door so when he opens it the whole thing tips into his house (my brothers did that one once to a teacher, dickheads). Put dog shit in the bin as floaters before leaning it. If you are in a really bad area you put an ad out on craigslist for someone with HIV to participate in research. When they call you pay them $20 for a used needle. You then stick him with an hiv needle. But seriously, do everything legal you can before you catch yourself hot under the collar and do something stupid.