New Delhi, Oct. 18 -- The United States and the United Nations slapped sanctions on the former head of Haitian presidential security and the leader of a Haitian gang on Friday for their roles in criminal gang activities that have destabilized the impoverished Caribbean nation.

The U.S. Treasury Department said the two men supported a coalition of gangs that the Trump administration designated as a foreign terrorist organization earlier this year.

The U.N. Security Council unanimously adopted a resolution hours later ordering all 193 U.N. member nations to freeze the men's assets and impose a travel ban. The resolution also imposes an arms embargo on Haiti.

The sanctions were placed on Dimitri Herard, who was head of presidential securi...