I mean, we do have a far-left but it's not particularly doing stuff right now. The last time it was active they were blowing up buildings across the US or trying to bomb the US capitol [1] [2]. We're 30-40 years removed from that, and the far-right is more active right now. They definitely do exist and I'd say groups that are analogous to them certainly exist right now.
1: https://www.smithsonianmag.com/history/1980s-far-left-female... 2: https://www.thenation.com/article/archive/remembering-left-w...