In 1915, Haiti's new President Vilbrun Guillaume Sam sought to strengthen his tenuous rule by a mass execution of 167 political prisoners. Outrage at the killings led to riots, and Sam was captured and killed by a lynch mob. Fearing possible foreign intervention, or the emergence of a new government led by the anti-American Haitian politician Rosalvo Bobo, President Woodrow Wilson sent U.S. Marines into Haiti in July 1915. The , under Rear Admiral Caperton, arrived in Port-au-Prince in an attempt to restore order and protect U.S. interests. Within days, the Marines had taken control of the capital city and its banks and customs house. The Marines declared martial law and severely censored the press. Within weeks, a new pro-U.S. Haitian president, Philippe Sudré Dartiguenave, was installed and a new constitution written that was favorable to the interests of the United States. The constitution (written by future US President Franklin D. Roosevelt) included a clause that allowed, for the first time, foreign ownership of land in Haiti, which was bitterly opposed by the Haitian legislature and citizenry.