William Casey, Who Uncovered Police Corruption, Dies at 78 He was the unsung investigator whose dogged undercover probe exposed the “Dirty 30” scandal in a Harlem precinct. Author: SAM ROBERTS Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)MoreClick to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Tumblr (Opens in new window)