jury in August 1950. In February 1951, weeks before the trial, he changed his testimony to claim that Ethel had typed up his notes. He testified against his sister and her husband in court in 1951 as part of an immunity agreement. In exchange for that testimony, the government allowed Ruth to stay with their two children. She was named a co-conspirator, but was never indicted. Greenglass told the court, "I had a kind of hero worship there with Julius Rosenberg and I did not want my hero to fail ..." During subsequent testimony in 1951, Greenglass related in detail the secrets he passed on to the Soviet Union. He falsely attributed passing the cross-section drawing of the Atom Bomb to the Soviets to Julius and he also acknowledged passing other sketches through Gold. He described his work on the molds into which were poured the component of the explosive lenses of the Fat Man bombs used for the Trinity nuclear test and in the bombing of Nagasaki. At first this was a matter of difficulty for the prosecution, who wanted Greenglass to testify in open court about the secrets he had given—something which would by definition make them no longer "secret". The Atomic Energy Commission decided that the implosion concept could be declassified for the trial, and limited all discussion to the weapons used in World War II (fearing that Greenglass may have seen prototypes for future weapons while at Los Alamos). As a result of a surprise defense motion that all testimony about the alleged "secret of the atomic bomb" be impounded, Federal Judge Irving Kaufman at first made all spectators and news reporters leave the room when Greenglass began testifying about his "secrets". Ten minutes later, Judge Kaufman invited the news reporters back in, asking them to use their discretion in reporting on Greenglass's testimony. The Rosenbergs' defense attorney, Emanuel H. Bloch, attempted to convince the jury that his clients were concerned about issues of national security, but failed. Greenglass' testimony, later seen to be crude and in the words of many scientists who examined it "worthless", remained sealed until 1966. He also testified that Rosenberg had stolen and given to the Soviets a proximity fuze. However, Aleksander Feklisov also claimed that Julius Rosenberg supplied him with a whole proximity fuze, which would corroborate at least this part of Greenglass' testimony. During the trial, Bloch claimed Greenglass