In 1881, shortly after the assassination of Tsar Alexander II, he was expelled from Switzerland. After a short stay at Thonon (Savoy), he stayed in London for nearly a year. He attended the Anarchist Congress in London from July 14, 1881. Other delegates included Marie Le Compte, Errico Malatesta, Saverio Merlino, Louise Michel, Nicholas Tchaikovsky and Émile Gautier. While respecting "complete autonomy of local groups", the congress defined propaganda actions that all could follow and agreed that propaganda by the deed was the path to social revolution. The Radical of July 23, 1881 reported that the congress met on July 18 at the Cleveland Hall, Fitzroy Square, with speeches by Marie Le Compte, "the transatlantic agitator", Louise Michel, and Kropotkin. Later Le Compte and Kropotkin gave talks to the Homerton Social Democratic Club and to the Stratford Radical and Dialectical Club.