2004 USA: The battle over immigration policy is heating up in the Arizona desert, where humanitarian organizations are setting up water stations to aid illegal immigrants and self-described "gun-toting patriots" are trying to catch people crossing the border illegally.

The newly formed Civil Homeland Defense group is conducting armed patrols of the border, citing the area as a prime spot for terrorists to enter as well. But organizations aiding the immigrants call these patrols dangerous and say they are a throwback to the Old West, when armed posses carried out vigilante-style justice across the southwestern U.S.

"All we want is for our border to be secure from terrorists or anyone who wants to harm the United States," said Chris Simcox, the group's founder, a loaded .45-caliber pistol holstered on his hip.