http://www.gambling-law-us.com/Federal-Laws/internet-gambling-ban.htm
"Aider and Abettor Liability
The federal aider and abettor statute, 18 U.S.C. 2, provides:
"(a) Whoever commits an offense against the United States or aids, abets, counsels, commands, induces or procures its commission, is punishable as a principal.