One group that is actually good at this is the Church of Scientology. Back when Anon members were protesting outside their properties the church actually hired PIs to essentially follow the protesters home from the actual protest to find out where they live, who they are, who their families are, and where they work. Afterwards Scientology started smear campaigns against them.
Note, not advocating support for either the cult of Scientology or the hacktivist group Anon simply stating different tactics used against and by protesters.
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