In the years following the organization's first convention, the UNIA began to decline in popularity. With the Black Star Line in serious financial difficulties, Garvey promoted two new business organizations the African Communities League and the Negro Factories Corporation. He also tried to salvage his colonization scheme by sending a delegation to appeal to the League of Nations for transfer to the UNIA of the African colonies taken from Germany during World War I.
Financial betrayal by trusted aides and a host of legal entanglements (based on charges that he had used the U.S. mail to defraud prospective investors) eventually led to Garvey's imprisonment in Atlanta Federal Penitentiary for a five-year term. In 1927 his half-served sentence was commuted, and he was deported to Jamaica by order of President Calvin Coolidge.
Garvey then turned his energies to Jamaican politics, campaigning on a platform of self-government, minimum wage laws, and land and judicial reform. He was soundly defeated at the polls, however, because most of his followers did not have the necessary voting qualifications.
In 1935 Garvey left for England where, in near obscurity, he died on June 10, 1940, in a cottage in West Kensington.