Los Angeles -- Leaders of immigrant advocacy groups Wednesday denounced President Bush's brief mention of a guest worker program during his State of the Union address, saying it would separate families and is unrealistic. Two former workers of the Bracero Program — the U.S. guest worker system with Mexico from 1942 to 1964 — also said no new program should be started until all former guest workers collect unpaid retirement funds. Bush devoted less than 100 words to immigration out of a 50-minute speech Tuesday night, but it was enough to rankle immigrant advocates. About a dozen advocates gathered to...