The Irish leveraged the "White Star Line" for passage from Europe to America in search of a better living to escape their oppressive poverty. They saw these ships as a vessel of hope.
RMS Titanic. I might be mistaken but I thought I had heard references that Titanic was owned by Cunard. In truth "White Star Lines" owned the Titanic and was forced to merge with Cunard at a later date due to financial difficulties.
Marcus Garvey's Black Star Line was more of a grass roots effort. He had the forces of the American government working against him.
The Black Star Line was a shipping line incorporated by Marcus Garvey, organizer of the UNIA (Universal Negro Improvement Association). The shipping line was supposed to facilitiate the transportation of goods and eventually African Americans throughout the African global economy. It derived its name from the White Star Line, a line whose success Garvey felt he could duplicate, which would become a standard of his Back-to-Africa movement