revision preference src: He joined with Marcus Garvey's Universal Negro Improvement Association (UNIA) and served as a Captain on the SS Yarmouth of the Black Star Line. However, disagreements with the UNIA lead to his resignation in 1921. <SEP> tgt: He joined with Marcus Garvey's Universal Negro Improvement Association (UNIA) and served as a Captain on the SS Yarmouth of the Black Star Line. Disagreements with the UNIA lead to his resignation in 1921.