Mayor Zohran Mamdani last week tore off the mask: He’s going full-on antisemite.

At last Thursday’s rally for his slate of extremist House candidates — Brad Lander, Darieliza Avila Chevalier and Claire Valdez — Mamdani railed that we’re now living in a “time of monsters.”

Who are these monsters? Though they “take many forms,” it’s . . . AIPAC.

Yep: Per Mamdani, The American Israel Public Affairs Committee is the heart of all evil in America; the only thing it fears more than democracy “is an end to genocide.”

Reality check: AIPAC is an entirely legal political outfit that operates like dozens of other issue-oriented PACS, including much larger ones that support Mamdani and his causes.

Reality check II: Israel’s recent war in Gaza featured no “genocide”; the Palestinian population has grown since Hamas started that war, indeed has grown every decade that Jerusalem has controlled Gaza and the West Bank.

But facts don’t matter when haters are on a roll; neither does nuance. The Mamdani ticket’s foes in these races, like Manhattan Rep. Dan Goldman and Brooklyn Borough President Antonio Reynoso, aren’t simply fellow Democrats on the other side of a few issues.

They literally support genocide, the mayor argues, as tools of AIPAC, which moves “millions in dark money to accomplish a single goal: to preserve their power so they can turn us against one another.”

The idea that Jews secretly plot to divide and control society isn’t new; it was a common theme in Tsarist Russia and 1930s Germany; today it’s big in Arab media and progressive campaigns: The Jews (not Messi’s three goals) robbed Algeria in that World Cup match; AIPAC is why everyone’s hearing about Graham Platner’s sordid past of . . . a few months ago.

Mamdani’s classic antisemitic themes got worse: The Jews put more cash into AIPAC than they’d ever pay in taxes, he proclaimed, albeit without using the words “money-grubbing.”

Again, PACS and “dark money” of all kinds serve the left as well as the rest of the political spectrum, but the money is only tainted when it comes from the Jews.

Nor was it just one rally: Mamdani and his candidates did an interview last week with radical left influencer Bartley Blakeley, who openly adores Hamas and compares its late leader Yahya Sinwar to Martin Luther King.

Blakeley also promotes the wacko beliefs that Israel perpetrated 9/11 and created ISIS.

Fake-populist brocaster Hasan Piker, another pal of the mayor, also backs bizarre conspiracies about 9/11, insinuating that a couple of 767s flying at top speed couldn’t have destroyed the Twin Towers.

Chevalier attended the Times Square pro-Hamas rally on Oct. 8, 2023; even Mamdani waited a week or two before joining in such demonstrations.

Mamdani supposedly represents the fresh face of the Democratic Party.

Too bad the new blood keeps pushing this ancient hate.