In April 1910 he was promoted to corporal. His company commander declined to promote him to sergeant, the usual rank for a potential officer, commenting that the young man clearly felt that nothing less than Constable of France would be good enough for him.
Garvey involved himself with the National Club, Jamaica's first nationalist organization, becoming its first assistant secretary in April 1910. The group campaigned to remove the British Governor of Jamaica, Sydney Olivier, from office, and to end the migration of Indian "coolies", or indentured workers, to Jamaica, as they were seen as a source of economic competition by the established population. With fellow Club member Wilfred Domingo he published a pamphlet expressing the group's ideas, The Struggling Mass.