There have been cases on the left of antisemitism and failing to deal with antisemitism but I have not seen any evidence that Mamdani either harbours antisemitic views himself or doesnt take the issue of antisemitism very seriously. I will absolutely call it out and do call it out when I see it but the absolute peak of the claims against Mamdani are that he used a slogan that can be taken in a bad way, but also a not bad way, one time. I think worse things have been said in these topics and were the tamest political discussion on the internet. Of course I am open to being proven wrong.