lost his seat on the Politburo Standing Committee. In the aftermath of the Tiananmen Square demonstrations Zhao Ziyang's reforms were rescinded, and the former CCDI inspection groups were reestablished. Commission power was increased, and the CCDI issued the "five forbiddens"; party members could not "(1) operate a business, (2) work in an economic entity, (3) trade in stocks, (4) accept gifts, or (5) use public funds for lavish entertainment." The 14th National Congress, in 1992, strengthened CCDI and local CDI investigative powers. According to the amended party constitution, local CDIs could initiate preliminary investigations against members of the local party committee at the CDI's level before a formal investigation began. If a full investigation was warranted, the local CDI had to obtain approval from its higher-level CDI and the corresponding party committee. In 1995 its powers were increased further, with each CDI given the responsibility to vet officials before their appointment to a post. The shuanggui system (see below) was established in 1994 by order of the CCDI; it was first officially mentioned in Article 28 of the Regulation on Dealing with Cases of Party Discipline Violations, which came into effect on 1 May 1994. Institution-building (2002–present) The CCDI was further reformed at the 16th National Congress in 2002; the CCDI Secretary was now the chief coordinator of all anti-corruption efforts on the mainland, a position later known as Leader of the Central Leading Group for Inspection Work. This was further codified in 2004 and 2005 with the "Internal Supervision Regulation" (ISR), institutionalising the inner-party supervision system and the Interim Provisions on DICs' Role in Assisting the party Committees with the Organisation and Coordination of Anti-Corruption Work. The terminology used in the battle against corruption was changed at the congress; "fighting corruption" became "fighting and preventing corruption". The Hu Jintao-led leadership, which lasted from the 16th–18th National Congress, saw growth in CCDI power and influence, demonstrated most clearly by the increased attendance of PSC members at CCDI plenary sessions. Under Secretary Wu Guanzheng, the CCDI established its first central inspection teams in August 2003. These teams, led by retired ministerial-level officials and reporting to the CCDI rather than local party committees, were empowered to initiate investigations, conduct interviews and review relevant documents. The opinion of a central inspection team was an important factor in determining whether or not an official was disciplined, and the teams played an important role in