In an effort to head off challenges to his leadership, Chairman Mao unleashed a wave of unrest that swept across China in the 1960s.

He wanted to root out opposition and rid the country of any semblance of old Chinese culture, social values and history.

At the forefront of the Cultural Revolution were the Red Guards - young, radical students and fanatical supporters of Mao and his circle.

Parents and teachers were vilified and in some cases beaten and killed. Old temples, architecture and literature were destroyed too.

Saul Yeung was a member of the Red Guards. He spoke to Witness about his memories of that time and the guilt he still carries.

Witness: The stories of our times told by the people who were there.