The anti-imperial, Communist-leaning, anti-war Left has been de-platformed a lot through the ages though. So its been biting that segment of the Left for a long long time.
If I'm interpreting correctly, either you mean the group of people who are all of those things, or anyone on the left who is one or more of those things.
If you mean the former, then you mean a very small group of people. Very small. No one is a communist these days. People who are aren't even necessarily anti-war, or anti-imperial. The group of people is so small it's not even really worth commenting on for such a macro issue
If you mean the latter, then you're lumping a very large, very diverse group of people together. So diverse that there's very little point commenting on their collective views