labour. For instance, Mei Zhi and her husband were sent to a tea farm in Lushan County, Sichuan, and she did not resume writing until the 1980s. Documents released in 1980 regarding the prosecution of the Gang of Four show more than 2,600 people in the field of arts and literature were revealed to have been persecuted by the Ministry of Culture and units under it alone. Many died as a result of their ordeal and humiliation—the names of 200 well-known writers and artists who were persecuted to death during the Cultural Revolution were commemorated in 1979, these include writers such as Lao She, Fu Lei, Deng Tuo, Baren, Li Guangtian, Yang Shuo and Zhao Shuli. Numerous people involved in the theater were persecuted or killed, including Wu Han, writer of Hai Rui Dismissed from Office, as well as Tian Han, Sun Weishi, and Zhou Xinfang. During the Cultural Revolution, only a few writers who gained permission or requalification under the new system, such as Hao Ran and some writers of worker or farmer background, can have had their work published or reprinted. The permissible subject matter of proletarian and socialist literature would be strictly defined, and all the literary periodicals in the country ceased publication by 1968. The situation eased after 1972, more writers were allowed to write, and many provincial literary periodicals resumed publication, but the majority of writers still could not work. The effect is similar in the film industry. A booklet titled "Four Hundred Films to be Criticized" was distributed, and film directors and actors/actresses were criticized with some tortured and imprisoned. These included many of Jiang Qing's rivals and former friends in the film industry, and those who died in the period included Cai Chusheng, Zheng Junli, Shangguan Yunzhu, Wang Ying, and Xu Lai. No feature films were produced in mainland China for seven years apart from the few approved "Model dramas" and highly ideological films, a notable example of the handful of films made and permitted to be shown in this period is Taking Tiger Mountain by Strategy. During the Cultural Revolution, composers of Yellow Music, which had already banned following the communist takeover, were persecuted, including Li Jinhui who was killed in 1967. Revolution-themed songs instead were promoted during the Cultural Revolution, and songs such as "Ode to the Motherland", "Sailing the Seas Depends on the Helmsman", "The East Is Red" and "Without