Morton Sobell, who was convicted in the Cold War spy trial that delivered Julius and Ethel Rosenberg to their deaths and divided the nation for decades, died in December in Manhattan, a relative confirmed on Wednesday. He was 101. Mr. Sobell, whose death was not reported at the time, had lived for many years on the Upper West Side and had recently been in nursing care. The family member asked not to be identified. Serving 18 years in prison until he was released in 1969, Mr. Sobell proclaimed his innocence until 2008, when, in an interview with The New York...