Extremely important: teach them the word "tankie". Once they start using it the exact same way "leftists" use it the "leftists" will literally shit themselves, cry, and then be forced to spend a few years inventing a new word for anyone they find insufferable.
Once they invent another word, we can teach that to the right too. Rinse and repeat and the "leftists" and right will be too busy fighting each other to fight us.