For me, it was mainly the philosophy and politics teachers. Boy oh fucking boy, for some reason, every single one of my philosopy and PolSci teachers were... interesting personalities to say the least. It was our philosophy teacher who introduced us to the Labor Theory of Value, oddly enough, and the issue of economic inequality. And as for the PolSci-Side, two teachers stand out: One grew up in the GDR and was very, very nostalgic about it (with some fair criticisms, especially concerning the Stasi), and the second, and final one in my case, was an irony-poisoned super-leftist with a gigantic disdain for the rich, the state and capitalism.
Will never forget back in high school we had a "should gay marriage be legal" debate. You went to a side of the room based on whether you wanted it or not.
Hoss of a teacher went to stand with the don't want, and we were all like wtf dude. He was an anarchist and didn't want the state to have a say on any marriage being illegal
As an anarchist he gets the wall
We had the same debate at my Christian high school. We came to the consensus of abolishing civil marriage and letting anyone get a civil union.