John Lindh (defendant) was an American citizen who sought military training abroad from an extremist Islamic group that was designated as a terrorist organization by the United States government. Following this training, Lindh travelled to Afghanistan to swear allegiance to the Taliban and join in fighting its fundamentalist jihad. Lindh personally met with Osama Bin Laden and fought against United States allies, even after being informed of the September 11 attacks. Lindh’s military group eventually surrendered and was detained by United States forces. While detained, Lindh participated in an escape attempt during which a United States agent was killed. Lindh was returned to the United States and charged with multiple federal crimes, including providing material support to a designated terrorist organization. Lindh moved to dismiss the material support charges on the grounds that the statute was unconstitutionally overbroad and vague.