McCarthy did not use violence to overthrow the government.
But people were afraid to speak out against him. If you want to cite an example of Americans trying to overthrow the government how about Father Coughlin and the brownshirts, along with both Dems and Republicans in national office trying to overthrow the FDR government prior to WWII. All Nazi sympathizers.
https://newspapers.ushmm.org/events/father-coughlin-blames-jews-for-nazi-violence