The largest socialist group in the U.S. says its membership is climbing since New York state Rep. Zohran Mamdani became the presumptive Democratic nominee for the New York City mayoral election on Tuesday.

Zohran Mamdani had just been elected Democratic nominee for the mayor of New York — a jaw-dropping achievement for a politician who most voters in America’s most populous city had barely heard of a few months ago.

New York State Assembly member Zohran Mamdani’s ascension to presumptive Democratic nominee in New York’s mayoral race has reinvigorated the conversation about which ideological faction of the Democratic Party should lead the way as it aims to rebuild.