What methods did the red guards use to denounce counter revolutionaries

 The acted as spies.They would spy on their parents to see if they were criticizing  Mao  and his administration and would then report back.
The red guard were recruited by Mao from schools and often met at night. Mao Zedong ordered that their activity be broadcasted in the media.

• thriving cities
• wealthy merchant class
• classical heritage of Greece and Rome