The Great Depression decimated the prices of Haiti's exports and destroyed the tenuous gains of the previous decade. In December 1929, Marines in Les Cayes killed ten Haitians during a march to protest local economic conditions. This led Herbert Hoover to appoint two commissions, including one headed by a former US governor of the Philippines William Cameron Forbes, which criticized the exclusion of Haitians from positions of authority in the government and constabulary, now known as the "Garde d'Haïti". In 1930, Sténio Vincent, a long-time critic of the occupation, was elected president, and the US began to withdraw its forces. The withdrawal was completed under US President Franklin D. Roosevelt (FDR), in 1934, under his "Good Neighbor policy". The US retained control of Haiti's external finances until 1947. All three rulers during the occupation came from the country's small mulatto minority. At the same time, many in the growing black professional classes departed from the traditional veneration of Haiti's French cultural heritage and emphasized the nation's African roots, most notably ethnologist Jean Price-Mars and the journal "Les Griots", edited by Dr. François Duvalier.