The answer depends on whether the problem involves a visa, a petition requesting permission to enter the United States, or labor certification.If the problem involves a visa, it probably involves the Department of State, which is the only federal agency than can issue a visa. There are two types of visas: Nonimmigrant Visa: a multicolored stamp placed in the passport, allowing the bearer to enter the United States temporarily for a specific purpose, identifies this visa. Immigrant Visa: not stamped in a passport, but is a packet of documents surrendered to an immigration officer at the port of entry. The packet includes an approved petition filed by an individual, a business or an organization (such as a religious group) seeking to sponsor an immigrant's entry into this country. If the problem involves a petition requesting permission to enter the United States as an immigrant, or under certain circumstances, as a nonimmigrant, such as for employment or as a fianc�, the situation involves USCIS. If the problem involves labor certification, it involves the Department of Labor.