Unidentified men watch for authorities as they climb onto United States soil from the Rio Grande river near Laredo, Texas In spite of U.S. efforts to crack down on illegal immigration and drug smuggling on the U.S-Mexico border, recent reports from U.S. law enforcement agencies indicate such activity is again on the increase. There's also been an increase in violent clashes between U.S. agents and Mexican smugglers in the border area. Some property owners on the U.S. side of the border have taken up arms as a result of what they describe as threats to their lives and livelyhood. Ranchers...