The A visa-holders enjoy diplomatic immunity and, under the Vienna Convention or separate consular treaty with their country, they are not subject to the jurisdiction of the United States.
A-1: This visa is for heads of state, high military officials, cetain officers assigned to diplomatic missions, and their immediate family.
A-2: This visa is for other accredited officials of the foreign government and their immediate family.
A-3: This visa is for attendants, servants, personal employees, and members of their immediate family of the A-1 and A-2 visa holders.
This visa is for officials, employees, and dependents of international organization that are quasi-governmental, such as United Nations (UN), the Organization of American States (OAS)the World Bank, and the International Monetary Fund (IMF).
G-1: This visa is for the principal representative, family, and staff as long as they are assigned on a “resident basis.”
G-2: This visa is for other (non-principal) representatives of a recognized government who are assigned to an international organization, and to members of their immediate family.
G-3: This visa is for officials of governments without de jure recognization by the USA, who are assigned to the international organization and members of their immediate family. Persons included in this final category are nationals of non-recognized countries or nationals for countries that are not members of the international organization.