The U.S. immigration laws are designed to protect the health, welfare, and security of the United States. Therefore, these laws prohibit the issuance of visas to applicants who fit within certain categories. Among those who must be refused visas are those with a communicable disease, those with a dangerous physical or mental disorder, those who have committed serious criminal acts, and those who have used illegal means to enter the United States.From the information given above, it can be validly concluded that, under U.S. immigration laws,