u/ChickenNoodle519 - originally from r/GenZhou
Party for Socialism and Liberation. Of the many communist parties that have existed in the US over the years, they're just about the only one that's still active and still definitely communist.

I voted for their candidate Gloria La Riva in 2020. For most of the campaign her VP pick was Leonard Peltier, an indigenous activist that's been wrongfully imprisoned for decades related to the killing of some feds. (He had to drop out due to health issues unfortunately)

u/RedVentrata - originally from r/GenZhou
among Marxists yes. but among Americans in general no (unfortunately), which is the case for any communist party here. They do seem to get the most votes in presidential elections among socialist candidates though.

but! the socialist movement is undoubtedly growing over the last few years. every group on the left, from socdems to anarchists to communists, have seen a significant increase in membership and activity.