Unfortunately Marxists have captured the socialist public school curriculumn, and are using the school systems in America to indoctrinate kids into becoming political Marxist actuvists.

The recent book "The Maxification of Education" by James Lindsay does a deep dive into it.

An easier read that mainly exposes how queer Marxism (LGBT) is indoctrinating kids in schools is "The Queering of the American Child" by Logan Lancing and James Lindsay.