My parents didn't try to make us radicals, but me and my bros all read LOTR and the Hobbit at a young age, it doesn't hurt the socialist development for sure. I'd say any books that describe how the US lies to maintain it's murderous military dominance. Raising a kid with ideals like love and kindness, sharing, respect for different types of people and cultures, then showing them plainly how awful the US is, is probably a good way to put them on the right path.

One of my key points of turning away from the patriotic ideal boy was reading a Scholastic book about US wars. Revolutionary War, WW2 made sense, but they got to the section on Vietnam and basically said "we lied to get into the war, and then massacred villagers for a few years because we hate commies. We also shot American college students because they got mad at us. God Bless America!"

Also don't watch Disney. I credit my parents refusal of Disney material to help me develop properly as well.