It’s been a busy couple of months for Lina Khan, former President Joe Biden’s head of the Federal Trade Commission, who waged a one-woman campaign against American businesses until President Donald Trump told her “You’re fired.” First, Khan was spotted working on socialist New York City Mayor Zohran Mamdani’s transition team. Birds of a feather, as they say. Then, she was granted her very own think tank at Columbia Law School, called the Center …