Hundreds of thousands of Americans in big cities have been stopped on the street by police using a law-enforcement practice called stop-and-frisk that alarms civil libertarians but is credited by authorities with 'helping reduce crime.' Police in major U.S. cities stop and question more than a million people each year -- a sharply higher number than just a few years ago. Most are black and Hispanic men. Many are frisked, and nearly all are innocent of any crime, according to figures gathered by The Associated Press.