Former UK Labour leader Jeremy Corbyn, who was ousted after a series of antisemitism scandals, addressed supporters of New York City mayoral candidate Zohran Mamdani in a virtual campaign event. Corbyn praised Mamdani's anti-Israel stance and progressive policy proposals, while critics and Jewish community leaders expressed alarm over both politicians' records and rhetoric. The event, organized by the Democratic Socialists of America, excluded several reporters from Jewish and conservative outlets, drawing further controversy. Corbyn's involvement in Mamdani's campaign has intensified debate ahead of the upcoming mayoral election, with opponents highlighting Corbyn's history and the Labour party's documented failures on antisemitism under his leadership.