A one-time Manhattan doctor has been indicted by a federal grand jury on allegations that he sexually abused dozens of female patients over a period of decades. Federal prosecutors say Robert Hadden, formerly affiliated with Columbia University, allegedly abused both minors and adults from the early 1990s through 2012. Among his victims, they say, was a young woman he delivered as a baby and then later allegedly abused as a minor. Hadden was arrested at his New Jersey home by FBI agents Wednesday morning. Acting Manhattan U.S. Attorney Audrey Strauss, at a news conference to unveil the indictment, called Hadden "a predator in a white coat." "His conduct was neither normal nor medically necessary," Strauss said. The New York Times reported in February that dozens of women have accused Hadden of sexual abuse -- among them Evelyn Yang, the wife of former presidential candidate Andrew Yang. Many of them are now suing Hadden and the university.