The U.S. State Department website has information on immigrant and nonimmigrant visas and U.S. embassies and consulates worldwide. It also has the latest Visa Bulletin.
The U.S. Citizenship & Immigration Service (USCIS) (a Homeland Security Department agency) is responsible for all nonimmigrant, immigrant, and naturalization matters.
The Executive Office for Immigration Review (EOIR) is responsible for conducting and reviewing any number of administrative hearings related to immigration matters, including removal, employment discrimination, document fraud, and employer sanctions.
The Office of Special Counsel for Immigration-Related Unfair Employment Practices (a Justice Department agency) is responsible for protecting immigrants from unlawful discrimination in the workplace.
The Internal Revenue Service website has links to tax forms and information.
The Department of Homeland Security includes several important government agencies, including Immigration and Customs Enforcement, U.S. Citizenship and Immigration Services, and U.S. Customs and Border Protection.
U.S. Customs and Border Protection is one of the Department of Homeland Security’s largest and most complex components, with a priority mission of keeping terrorists and their weapons out of the U.S. It also has a responsibility for securing and facilitating trade and travel while enforcing hundreds of U.S. regulations, including immigration and drug laws.