Black Lives Matter co-founder Patrisse Cullors, who describes herself as a “trained Marxist” while also owning four homes in high-end neighborhoods worth more than $3.2 million, celebrated comparisons of the American left-wing movement to the deadly Chinese Cultural Revolution orchestrated by Mao Zedong. In a 2010 video of a United States Social Forum panel on “Transformative Organizing Theory” unearthed by the National Pulse, Cullors shares a story of a young activist in Arizona who showed interest in a left-wing book Cullors was promoting and compared it to Mao’s “Little Red Book.” “He grabbed the book,” Cullors said, referring to “The...