The US Department of Homeland Security published a notice in the Federal Register barring Haitians from being issued low skilled work visas. The Notice has an effective date of January 18, 2918.
"Under Department of Homeland Security (DHS) regulations, U.S. Citizenship and Immigration Services (USCIS) may generally only approve petitions for H-2A and H-2B nonimmigrant status for nationals of countries that the Secretary of Homeland Security, with the concurrence of the Secretary of State, has designated by notice published in the Federal Register. That notice must be renewed each year. This notice announces that the Secretary of Homeland Security, in consultation with the Secretary of State, is identifying 83 countries whose nationals are eligible to participate in the H-2A program and 82 countries whose nationals are eligible to participate in the H-2B program for the coming year."
See: Identification of Foreign Countries Whose Nationals Are Eligible To Participate in the H-2A and H-2B Nonimmigrant Worker Programs 83 FR 2646 Filed: January 17, 2018