By the Fall of 1956, China's leader, Mao Zedong abruptly reversed course and proclaimed that the true enemies of the Party had been exposed and 19-year-old Wu was subsequently singled out at his university. Wu later wrote of this experience: "This was the first time I had ever been singled out as a political troublemaker. Most of my classmates were more pragmatic than I, and they just repeated what the Communists wanted to hear." For the next few years, Wu was continuously criticized in Party meetings and closely monitored until his arrest in 1960 at the age of 23 when he was charged with being a "counterrevolutionary rightist", and was sent to the "laogai" (China's system of forced-labor prison camps).