Eight men and women, including two employees of Chicago's scandal-plagued city water department, were arrested Wednesday as federal investigators rolled up what they described as one branch of a Colombian drug-trafficking operation. The water department itself, already awash in charges of bribery and other political corruption, was not charged with being part of the heroin distribution ring. But investigators did find that department workers "were engaging in this kind of conduct during weekdays, during workdays, when they should not have been," U.S. Attorney Patrick J. Fitzgerald said at a news conference. Federal officials said the ongoing investigation got under way...