the 'far left' in the USA is barely left of center. problem is most rubes buy into the ultra right framwork of most of these discussions.
a "centrist" in terms of current US politics is just a right winger due to how far the overton window spectrum has shifted rightwards. the true center is social democracy (bernie sanders).
"far left" = universal healthcare, education, and social benefits
far right = fascism, forced hysterectomies, cutting of social benefits, unfettered capitalism while taxpayers subsidize the oligarchs, imperialistic military and world hegemony
there's literally no comparison