In 2003, Bo Gritz published his third book, My Brother’s Keeper, a 653-page tome he describes as a "How-To Liberty Manual." The book purports to reveal the “hidden truths” behind America’s foreign and domestic "crimes" and describes how to “successfully stand against the government, media, and misguided public opinion.” He continued his practice of holding religious feasts commemorating ancient Israelite holidays; most recently he sponsored for his followers a Feast of Tabernacles celebration from October 10-17, 2003, in Tyler, Texas.

Gritz was slated to speak at the national convention of the America First Party (a conservative political party originally connected with Pat Buchanan) in Nashville, Tennessee on July 24-26, 2003. A faction within the party opposed giving Gritz a forum, however, and shortly before the convention Gritz was disinvited. In a press release, convention organizers wrote that Gritz’s “extreme intolerance” was unacceptable. Apparently referring to Gritz’s ties to militant anti-government and white supremacist groups, they added that “anyone who supports theories that we hoped had died with Adolph Hitler is not welcome in the America First Party.”