 In February 1927, he participated in the First Anti-imperialist Congress in Brussels, in which he raised the difference between APRA and communism.In November of that year he left Europe and returned to America, passing through New York City before returning to Mexico.He then undertook a tour of Guatemala, El Salvador, Costa Rica and, again, Panama, being prevented from landing in the Canal Zone and, rather, was exiled again to Europe on December 16, 1928.