Is NBC accusing the Minutemen, the civilian border-patrol group, of murder? That's the charge of the group's president, Chris Simcox, who points to a commercial for tonight's "Law and Order" episode dealing with illegal immigration. Simcox has sent a letter to NBC demanding the network "cease and desist" airing the promo. According to Simcox's Minuteman Civil Defense Corps, the promo includes the following verbiage: