One provision of the Gun Control Act of 1968 (codified at 18 U.S. Code § 922(g)) criminalizes firearms purchases by, and firearms sales to, people who have renounced United States citizenship. This provision, along with similar treatment for people adjudged mentally defective or dishonorably discharged from the U.S. Armed Forces, and a restriction on mail-order firearms sales, was aimed at preventing a repeat of the circumstances which allowed Lee Harvey Oswald to obtain the rifle which he used to assassinate President Kennedy. Oswald had never actually renounced his citizenship; he went to the U.S. embassy in Moscow one Saturday in 1959 intending to do so, but in order to delay him, Richard Edward Snyder requested that he come back on a weekday to complete the paperwork and swear the formal oath of renunciation, which Oswald never did.