Will Mamdani have the courage to stare down the teachers union boss?

City Council Speaker Julie Menin says she’s far more responsible than Mayor Zohran Mamdani; here’s his chance to prove her wrong on at least one front: the council’s obscene bid to shower $10,000 bonuses on public-school teaching assistants.

United Federation of Teachers boss Mike Mulgrew threatens “all-out war” if the mayor vetoes the bill to...