>>17928992
This pic is from a Vice article about FBI agents who joined the FRSO, which is a Maoist group in the U.S., but that was awhile ago. They tried to find a material connection to FARC, didn't find anything, and went with hail mary raids on a bunch of their houses, but eventually a grand jury (or something like that) dismissed the case.
There's also various stories out there of local police departments infiltrating left-wing groups. There was a cop (a younger rookie) who joined a DSA chapter in Colorado who had a cover story of being a prostitute ("sex worker") and she was oppressed and therefore didn't want to reveal too much information about herself because she could get in trouble. Pretty clever ruse. This stuff occasionally gets covered by bigger papers but it usually pops up in the activist press. There was another guy in Colorado who was in his 40s who worked as an informant, drove a hearse (really) with a bunch of guns in it, and tried to help set up illegal gun buys on 19-year-old DSA members who found his militant radical left-wing schtick impressive. The plot started to fall apart when one of the would-be marks showed up to a dirty, barely-furnished apartment where the cops were trying to get him to commit to the gun buy and he got weirded out. I think the cop girl was also involved but it's been awhile since I read that story.
There are bored cops, bored homeland security types, that will join activist groups. But like I was saying, I think the more violent groups attract greater attention. Hardcore natsoc groups is like joining Fight Club. Also there was (probably still is) a whole thing with radical environmentalists and animal liberation types. That also usually dovetails with anarchism. Like in the Pacific Northwest.