early stages of the Cultural Revolution. The primary goal of the radicals was to restructure existing political and social systems, as supposed "capitalist roaders" were corrupting the Socialist agenda. Primarily influenced by travel and a freer exchange of ideas from different regions of China, more joined the radical, rebel factions of the Red Guards by the second half of the Cultural Revolution. Some historians, such as Andrew Walder, argue that individuals and their political choices also influenced the development of Red Guard factions across China. Interests of individuals, interactions with authority figures, and social interactions all altered identities to forge factions that would fight for new grievances against "the system". Suppression by the PLA (1967–1968) By February 1967, political opinion at the center had decided on the removal of the Red Guards from the Cultural Revolution scene in the interest of stability. The PLA forcibly suppressed the more radical Red Guard groups in Sichuan, Anhui, Hunan, Fujian, and Hubei provinces in February and March. Students were ordered to return to schools; student radicalism was branded 'counterrevolutionary' and banned. These groups, as well as many of their supporters, were later branded May Sixteenth elements after an ultra-left Red Guard organization based in Beijing. May Sixteenth elements (五一六分子) were named after the so-called May Sixteenth Army Corps (五一六兵团; 1967–1968), ultra-left Red Guards in Beijing during the early years of the Cultural Revolution (1966–1976) who targeted Zhou Enlai with the backing of Jiang Qing. The name came from the historic May 16 Notice (五一六通知) which Mao Zedong partially wrote and edited, which triggered the revolution. However, Mao was concerned with its radicalism, so in late 1967 the group was outlawed on conspiracy and anarchism charges, followed by the arrest of most Cultural Revolution Group members (except Jiang Qing). A nationwide campaign was later launched to liquidate "May Sixteenth Elements", which created further chaos. There was a wide backlash in the spring against the suppression, with student attacks on any symbol of authority and PLA units, but not on Marshal Lin Biao, the Minister of National Defense and one of the Chairman's biggest allies. An order from Mao, the Cultural Revolution Group, the State Council, and the Central Military Affairs Committee of the PLA on 5 September 1967 instructed the PLA to restore order to China and end the chaos. The order came within months of incidents of PLA forces disobeying government and CRG