Query: Who was in charge of the MRP-AEG group?
Context: At a demonstration on May 1, 1987, young people showed up with banners and slogans despite an official ban. On August 15, 1987, former political prisoners formed the MRP-AEG group (Estonians for the Public Disclosure of the Molotov-Ribbentrop Pact), which was headed by Tiit Madisson. In September 1987, the Edasi newspaper published a proposal by Edgar Savisaar, Siim Kallas, Tiit Made, and Mikk Titma calling for Estonia's transition to autonomy.