Um, it's happening to the left now (including infiltration, active attempts by government provocateurs to discredit, and even government agents collaborating with violent non-government actors engaging in violent retaliation, etc.; BLM has been a particular target), with government power involved much more than in anything targeting the Right.

That seems to be GPs point, actually. It's silly when those on the right are pretending that th comparatively minor private exclusion that the more extreme Right is subjected to might sometime be directed at the Left. The Left is used to much worse, at the hands of the State along with private exclusion, routinely.

The Occupy movement was targeted and that was barely a decade ago.

African-American civil rights activists have been targeted pretty consistently for...well, most of American history, really.

Yep, Fred Hampton and MLK, Jr. being the most well-known, at least to myself.