If we're genuinely asking, real actual communism comes into play. I think children being raised by government programs and not their parents would be extreme left. Making it so that no one can have more than $1 million to their name would be extreme left. Forcing people to be impregnated and give up those babies to government to be raised by them would also be extreme. Maybe left? Prohibiting religions. Making it illegal to be Christian/Muslim/Buddhist/anything. Making it illegal to have a gender. The problem of oversimplifying everything into a spectrum of left and right means that there's no room for ideas to exist not on that spectrum.

I was genuinely asking, so thank you for replying with actual examples.

Forced euthanasia for people when they reach the age of 70. Legalized post-birth abortion until the child is 3. Testing people and sorting them into castes (alpha, beta, gamma, etc). Legalizing all drugs. I don't know if any real world political parties actually back these ideas, these are drawn from science fiction novels.