What word would you use for a left-wing activist who aggressively wants to name and shame, or purge, or get fired, or get banned, any person on the right who cr

What word would you use for a left-wing activist who aggressively wants to name and shame, or purge, or get fired, or get banned, any person on the right who crosses a certain line? These types of people exist, is is a real phenomena, so it needs a name.