What is the importance of the Great Proletarian Cultural Revolution as noted in the nonfiction book, Why Geography Matters: Three Challenges Facing America?

The Great Proletarian Cultural Revolution was one of Chairman Mao Zedong's initiatives in China. The Revolution was designed to purge China's Communists of any "contamination" from Russian Communists. The Revolution formed young Chinese into the Red Guards who were charged with ensuring bourgeois elements did not infiltrate Chinese society. Millions of people were tortured and killed during the Revolution.