A computer hacker got into the U.S. agency that guards the country's nuclear weapons stockpile and stole the personal records of at least 1,500 employees and contractors, a senior U.S. lawmaker said on Friday. The target of the hacker, the <A HREF="http://news.yahoo.com/s/nm/20060609/us_nm/crime_nuclear_hacker_dc">National Nuclear Safety Administration,</A> is the latest agency to reveal that sensitive private information about government workers was stolen.