What do you think mao meant when he called on students to root out the poisonous weeds in the schools?

Given the freedom to express themselves, liberal and intellectual Chinese began opposing the Communist Party and questioning its leadership. On June 8, 1957, Mao published an editorial in the Chinese Communist Party’s The People’s Daily. Mao declared that “poisonous weeds” had grown among the “fragrant flowers” within the one hundred blooming flowers of people’s criticism. Authors such as Jung Chang have alleged that the Hundred Flowers Campaign was merely a ruse to root out "dangerous" thinking.