I saw Columbia craziness up close — and the city’s headed that way if Zohran Mamdani becomes mayor

I enrolled in Columbia University’s undergraduate school for nontraditional students, the School of General Studies, in 2017 as a 33-year-old progressive Democrat. By the time I graduated in May 2020, my entire worldview had been upended. What I witnessed on campus was not education but indoctrination — a sweeping cultural revolution fueled by anti-Americanism, antisemitism…