You can't make an ideology illegal. Any aspect of that ideology that is illegal already has laws in place. So it would be pointless to try to make the entire ideology illegal, anyhow, and only risks pushing more people to it.
When someone is told they can't support something, it just makes people want to support it more due to anti-authoritative stances.
What aspects of communism are you concerned about needing to be made illegal that don't already have laws in place that will address them?
You can't make an ideology illegal. Any aspect of that ideology that is illegal already has laws in place. So it would be pointless to try to make the entire ideology illegal, anyhow, and only risks pushing more people to it.
When someone is told they can't support something, it just makes people want to support it more due to anti-authoritative stances.
What aspects of communism are you concerned about needing to be made illegal that don't already have laws in place that will address them?