In June and July 1921, 600 delegates who came to the Third World Congress of the Communist International from 52 countries were housed at Hotel Lux. With the sudden influx of so many international revolutionaries, the hotel began to be known as the "headquarters of the world revolution". Germany alone sent 41 delegates. The Hamburg Uprising was discussed at the hotel, both before and after the events. After the Comintern was founded, many of the Party's leading functionaries lived at the hotel, including Ernst Reuter and the hotel became the best known of the Comintern's buildings, although its offices were elsewhere.