I was Chairman Mao’s dog. What he said to bite, I bit.
Meaning of the quote
Jiang Qing was saying that she completely followed whatever Chairman Mao told her to do, even if it meant harming others. She had no mind of her own and simply obeyed Mao's orders without question, much like a dog would obey its owner. This quote reflects how Jiang Qing was loyal to Mao, but also how she was willing to do anything he asked, even if it was unethical or cruel.
About Jiang Qing
Jiang Qing, also known as Madame Mao, was a Chinese communist revolutionary and major political figure during the Cultural Revolution. She was the fourth wife of Mao Zedong and played a significant role in the events of that tumultuous period in Chinese history.