Pub. L. 91-452, tit. V, sec. 502

Sec. 502. The Attorney General of the United States is authorized to rent, purchase, modify, or remodel protected housing facilities and to otherwise offer to provide for the health, safety, and welfare of witnesses and persons intended to be called as Government witnesses, and the families of witnesses and persons intended to be called as Government witnesses in legal proceedings instituted against any person alleged to have participated in an organized criminal activity whenever, in his judgment, testimony from, or a willingness to testify by, such a witness would place his life or person, or the life or person of a member of his family or household, in jeopardy. Any person availing himself of an offer by the Attorney General to use such facilities may continue to use. such facilities for as long as the Attorney General determines the jeopardy to his life or person continues.