She Witnessed Mao’s Worst Excesses. Now She Has a Warning for the World.

In 1955, not long after Ms. Chen joined the Central Film Bureau, Hu Feng, a well-known Chinese Marxist writer, was detained for penning a report arguing that literature should allow for greater expressiveness. His words triggered a purge that rippled through Ms. Chen’s circle of friends and colleagues, some of whom were accused of being part of Mr. Hu’s “counterrevolutionary clique.” Then, unexpectedly, Mao began to welcome criticism of the party, urging a “hundred flowers to bloom,” a phrase meant to encourage people to speak up and criticize the party’s…