There's entire schools of left-wing thought that are deeply anti-authoritarian, many types of anarchism for instance are deeply rooted in collectivist ideology. There's also all manner of socialist schools of thought that favour strong degrees of civil liberties. The kind of Enlightenment-era ideologies that many modern Western democracies build their very foundations on today would have been considered radical, uncompromising left-wing zealotry by the hereditary nobility and strict social elitism they attempted with various degrees of success to overthrow.
Political ideologies in general are much more varied and in my opinion much more interesting than that tiny slice of the political compass the American overton window occupies. Authoritarianism is a property that can be attached to any ideology, left or right wing. It's not really useful to view politics as a one-dimensional axis from left to right, I think at a minimum two axes are needed, a collectivist-individualist axis and an authoritarian-libertarian axis to adequately compare ideologies relative to each-other. You could add even more axes such as traditionalist-reformist, localist-globalist, and probably many more.
Political ideologies in general are much more varied and in my opinion much more interesting than that tiny slice of the political compass the American overton window occupies. Authoritarianism is a property that can be attached to any ideology, left or right wing. It's not really useful to view politics as a one-dimensional axis from left to right, I think at a minimum two axes are needed, a collectivist-individualist axis and an authoritarian-libertarian axis to adequately compare ideologies relative to each-other. You could add even more axes such as traditionalist-reformist, localist-globalist, and probably many more.