When the former secretary of state and C.I.A. director Mike Pompeo, a man who had dealt firsthand with autocrats like Vladimir Putin and Xi Jinping, described Randi Weingarten as “the most dangerous person in the world” last November, it seemed as though he couldn’t possibly be serious. Weingarten is 65 and just over five feet tall. She is Jewish and openly gay — she’s married to a rabbi — and lives in Upper Manhattan. She is the longtime president of the American Federation of Teachers, which is not even the country’s biggest union of public-school educators. (The A.F.T. has 1.7...
