You, my friend, have described the concept of “Useful Idiot” quite aptly in your example of “the Antifa guy lined up next to me.
Leftists will be the ones screaming as they are dragged away: “Why are you doing this to me? I’m on your side! I believe in this cause! Why? WHY? WHYYYYYYYY?”
"Why? The better to create terror over the entire populace like Stalin did, m'dear."