In October, when Ronan Farrow published his first article in The New Yorker on the alleged transgressions of Harvey Weinstein, people in the media and entertainment industries wondered how NBC had missed the story. After all, Mr. Farrow had spent months gathering material on the mogul when he was with NBC News. Now a producer who worked closely with Mr. Farrow has accused the network of putting a stop to the reporting, saying the order came from the very highest levels of NBC." Rich McHugh, the producer, who recently left his job in the investigative unit of NBC News, is the first person affiliated with NBC to publicly charge that the network impeded his and Mr. Farrow's efforts to nail down the story of Mr. Weinstein's alleged sexual misconduct. He called the network's handling of the matter "a massive breach of journalistic integrity." "Three days before Ronan and I were going to head to L.A. to interview a woman with a credible rape allegation against Harvey Weinstein, I was ordered to stop, not to interview this woman," Mr. McHugh said. "And to stand down on the story altogether." There was a point in our reporting where I felt there were obstacles to us reporting this externally, and there were obstacles to us reporting this internally," the producer said. "Externally, I had Weinstein associates calling me repeatedly. I knew that Weinstein was calling NBC executives directly. One time it even happened when we were in the room."