nt the use of interstate commerce to facilitate prostitution, concubinage, or other forms of immorality. Hoke I United States, 227 U.S. 308 (1913); Wilson I United States, 232 U.S. 563 (1914); Caminetti I United States, 242 U.S. 470 (1917). The statute's primary purpose was to address the so-called commercial case of