[throwawaysea]

All Sides has an article noting the left leaning bias of Wikipedia, including references to five different studies. It also mentions how the cofounder of Wikipedia has called out the site’s liberal bias: https://www.allsides.com/blog/wikipedia-biased

Personally, I see it in articles on any topic that is controversial, particularly along the axis of the left-right divide in America. Wikipedia is a theater for activism/ideology just like every other space (like our work places) has been opted into the same war in the last 5 years or so. It is most apparent to me when I read an article about influential or popular figures who are moderate or right wing.