Santa Cruz County Sheriff Tony Estrada

Santa Cruz County Sheriff Tony Estrada

Eric Martin/Bloomberg

In Nogales, Arizona, Santa Cruz County Sheriff Tony Estrada, a 45-year law enforcement veteran elected six times over two decades, works in tandem with local police to oversee security in and around the town of 20,000. Estrada, 69, born in Mexico and brought to the U.S. by his parents as a child, said the lure of job opportunities in his adopted home and lack of them in Mexico and Central America continue to attract people more than six decades later.