Ethel Rosenberg was convicted based on false and perjured testimony of her brother Greenglass who was acting to protect his wife.  He had also given testimony to a grand jury which was significantly different from his trial testimony.  The U.S. government, apparently to prevent the public knowledge of his perjured testimony, had had his testimony sealed up for 60 years.  Now that we have read it, we know he was lying about several matters . . .