“These days the same people who are buying Alinsky’s book “Rules for Radicals” on Amazon.com are, according to the company’s software, also buying books like “Liberal Fascism,” “Rules for Conservative Radicals,” “Unholy Alliance: Radical Islam and the American Left,” and “The Shadow Party: How George Soros, Hillary Clinton, and Sixties Radicals Seized Control of the Democratic Party.” Those last two books were written by David Horowitz, who was a leading New Left polemicist in the 1960s and is now a leading polemicist on the right.”David Brooks