For whatever it’s worth, I’m an advocate of Montessori and I’m not left wing in the slightest. The things I like most about the Montessori approach are the focus on fostering independence at a young age and (some) freedom to focus on what the student is interested in.

I don’t think of either of those concepts as mapping particularly well to any left-wing ideology I’m familiar with except, perhaps, the back-to-the-land hippie movement.

Contrary to some of the BS in this thread, the kids do, in fact, learn to read and do math.