There are hundreds of posters depicting the Chairman Mao era in a very useful site Chinese Posters site. Some of the links below are to this site as they are an excellent insight of the Chinese propaganda of Mao’s rule.
The Great Leap Forward
This was the campaign which created communes and led to the death of tens of millions of peasants. Posters
While there are many videos, a few are:
The Cultural Revolution
This poster perhaps encapsulates this campaign better than any other as the young people took to the streets to destroy anything old, which is why I choose this as my book cover
More posters on Chinese Posters
Again lots of videos of these traumatic times – here’s a few