(Undated) -- A new survey says bullying is a problem in the American workplace, at all levels. The survey by CareerBuilder finds that 28-percent of U.S. workers report being bullied at work. Nearly one in five say it was so bad that they quit. The survey says bullying is more prevalent among certain minorities and lower-paid workers, but it's a problem for college-educated workers and those in management positions as well. CareerBuilder surveyed private sector workers at firms of all sizes across a range of industries.