Labrum - a cover which may be loosely referred to as the upper lip. Mandibles - hard, powerful cutting jaws. Maxillae - 'pincers' which are less powerful than the mandibles. They are used to steady and manipulate the food. Labium - the lower cover, often referred to as the lower lip.
The President, as head of the federal executive branch, is ultimately in charge of enforcing the immigration laws of the United States. In turn, he must make discretionary decisions about whether and when to prosecute immigration law violators through deportation and other sanctions.
Immigration Act of 1891. 1  First comprehensive immigration laws for the US. 2  Bureau of Immigration set up in the Treasury Dept. 3  Immigration Bureau directed to deport unlawful aliens. 4  Empowered the superintendent of immigration to enforce immigration laws.