They did it on Gary Franchi's libertarian-leaning rtr.org (the guy from Next News Network's Restore the Republic social media site) about 10 years ago. About 6 usernames showed up on the site one day, with Star of David flags as their icons. Then some "white supremacists" joined the site and attacked the jews in comment streams. Then Franchi shut down the site, retooled it, and when it came back up, no criticism of the precious jews was allowed. It all happened in about 10 days.