 Complete the following phrase:  In April 1992 Vinogradov declared his support for Moscows Mayor Yuri Luzhkov and the city government, defending them from accusations of corruption. The declaration was endorsed by other figures on the ficial scene, including Vladimir Gusinsky, Leonid Nevzlin and Mikhail Khodorkovsky, who formed an influential economic group known as PPI, which Vinogradov led from 1993. Although one of Yeltsins supporters in the years after the 