hools in Jinan were closed down by strikes as teachers were "struggled against". At the same time, big-character posters started to appear in the city. Red Guards took to the streets of Jinan from late August 1966 onwards, damaging cultural heritage and setting up courts to prosecute perceived enemies of the revolution. In the spring of 1967, the "May 7th Incident" took place: When Zhang Chunqiao and Yao Wenyuan, both later reviled as members of the Gang of Four, visited Jinan to support the Cultural Revolution and its local leader Wang Xiao Yu, fighting erupted in the front of the provincial government between two rival factions of the Cultural Revolution, the "April 22nd Group" and Wang Xiao Yu's "April 28th Group". In the end, more than 10,000 people had been involved in the fighting. On October 11, 1967, the tallest statue of Mao Zedong in Shandong province was erected on the campus of Shandong Normal University. On September 17, 1968, a large assembly of Jinan workers celebrated the arrival of a mango fruit in the "August 1st" Meeting Hall. The fruit had been a gift to the workers in Beijing by Mao and was subsequently passed on to the workers in Jinan. In November 1968, Wang Xiao Yu began to agitate against the local army units in Jinan and Shandong Province. By then unrest due to the Cultural Revolution had severely damaged the city's governmental and industrial infrastructure, with about 80% of all government institutions shut down. Large public protests were staged on April 4 and 5, 1969, in which approximately 500,000 people protested the occupation of Zhenbao Island by the Soviet Union. On July 29, 1970, the leadership of the Cultural Revolution passed a resolution to make sweeping changes to the city's educational system: The liberal arts departments of Shandong University were moved to Qufu and combined with Qufu Normal College to form a new Shandong University. The biology department was moved to Tai'an and merged into the Shandong Agricultural
