Julius and Ethel Rosenberg

Julius Rosenberg and Ethel Rosenberg were an American married couple who were convicted of spying for the Soviet Union, including providing top-secret information about American radar, sonar, jet propulsion engines, and nuclear weapon designs. They were executed by the federal government of the United States in 1953 using New York's state execution chamber in Sing Sing in Ossining, New York, becoming the first American civilians to be executed for such charges and the first to be executed during peacetime.
Other convicted co-conspirators were sentenced to prison, including Ethel's brother, David Greenglass, Harry Gold, and Morton Sobell. Klaus Fuchs, a German scientist working at the Los Alamos Laboratory, was convicted in the United Kingdom. For decades, many people, including the Rosenbergs' sons, initially maintained that both parents were - and later that Ethel was - innocent of spying and have sought an exoneration from multiple U.S. presidents.
Among records the U.S. government declassified after the fall of the Soviet Union are many related to the Rosenbergs, including a trove of decoded Soviet cables, which detailed Julius's role as a courier and recruiter for the Soviets. In 2008, the National Archives of the United States published most of the grand jury testimony related to the prosecution of the Rosenbergs. Freedom of Information Act requests filed about the Rosenbergs and the legal case against them have resulted in additional U.S. government records being made public, including formerly classified materials from U.S. intelligence agencies.

Early lives and education

Julius Rosenberg was born on May 12, 1918, in New York City to a family of Jewish immigrants from the Russian Empire. The family moved to the Lower East Side by the time Julius was 11. His parents worked in the shops of the Lower East Side as Julius attended Seward Park High School. Julius became a leader in the Young Communist League USA while at City College of New York during the Great Depression. In 1939, he graduated with a degree in electrical engineering.
Ethel Greenglass was born on September 28, 1915, to a Jewish family in Manhattan. She had a brother, David Greenglass. She originally was an aspiring actress and singer but eventually took a secretarial job at a shipping company. She became involved in labor disputes and joined the Young Communist League, where she met Julius in 1936. They married in 1939.

Espionage

Julius Rosenberg joined the Army Signal Corps Engineering Laboratories at Fort Monmouth, New Jersey, in 1940, where he worked as an engineer-inspector until 1945. He was discharged when the U.S. Army discovered his previous membership in the Communist Party USA. Important research on electronics, communications, radar and guided missile controls was undertaken at Fort Monmouth during World War II.
According to a 2001 book by his former handler Aleksandr Feklisov, Rosenberg was originally recruited to spy for the interior ministry of the Soviet Union, NKVD, on Labor Day 1942 by a former spymaster Semyon Semyonov. Rosenberg had been introduced to Semyonov by Bernard Schuster, a high-ranking member of the Communist Party USA and NKVD liaison for Earl Browder. After Semyonov was recalled to Moscow in 1944 his duties were taken over by Feklisov.
Rosenberg provided thousands of classified reports from Emerson Radio, including a complete proximity fuze. Under Feklisov's supervision, Rosenberg recruited sympathetic individuals into NKVD service, including Joel Barr, Alfred Sarant, William Perl, and Morton Sobell, also an engineer. Perl supplied Feklisov, under Rosenberg's direction, with thousands of documents from the National Advisory Committee for Aeronautics, including a complete set of design and production drawings for Lockheed's P-80 Shooting Star, the first U.S. operational jet fighter. Feklisov learned through Rosenberg that Ethel's brother David was working on the top-secret Manhattan Project at the Los Alamos National Laboratory; he directed Julius to recruit David.
In February 1944, Rosenberg succeeded in recruiting a second source of Manhattan Project information, engineer Russell McNutt, who worked on designs for the plants at Oak Ridge National Laboratory. For this success Rosenberg received a $100 bonus. McNutt's employment provided access to secrets about processes for manufacturing weapons-grade uranium.
The U.S. did not share information with, nor seek assistance from, the Soviet Union regarding the Manhattan Project. The West was shocked by the speed with which the Soviets were able to stage "Joe 1", its first nuclear test, on August 29, 1949. However, Lavrentiy Beria, the head official of the Soviet nuclear project, used foreign intelligence only as a third-party check rather than giving it directly to the design teams, whom he did not clear to know about the espionage efforts, and the development was indigenous. Considering that the pace of the Soviet program was set primarily by the amount of uranium that it could procure, it is difficult for scholars to judge accurately how much time was saved, if any.

Rosenberg case

Arrest

In January 1950, the U.S. discovered that Klaus Fuchs, a German refugee and theoretical physicist working for the British mission in the Manhattan Project, had given key documents to the Soviets throughout the war. Fuchs identified his courier as American Harry Gold, who was arrested on May 23, 1950.
On June 15, 1950, David Greenglass was arrested by the FBI for espionage and soon confessed to having passed secret information on to the USSR through Gold. He also claimed that Julius Rosenberg had convinced David's wife Ruth to recruit him while visiting him in Albuquerque, New Mexico, in 1944. He said Julius had passed secrets and thus linked him to the Soviet contact agent Anatoli Yakovlev. This connection would be necessary as evidence if there was to be a conviction for espionage of the Rosenbergs.
On July 17, 1950, Julius was arrested on suspicion of espionage, based on David Greenglass's confession. On August 11, 1950, Ethel was arrested after testifying before a grand jury. Another conspirator, Morton Sobell, fled with his family to Mexico City after Greenglass was arrested. They took assumed names, and he tried to figure out a way to reach Europe without a passport. Abandoning that effort, he returned to Mexico City. He claimed that he was kidnapped by members of the Mexican secret police and driven to the U.S. border, where he was arrested by U.S. forces. The U.S. government claimed Sobell was arrested by the Mexican police for bank robbery on August 16, 1950, and he was extradited the next day to the United States in Laredo, Texas.

Grand jury

Twenty senior government officials met secretly on February 8, 1950, to discuss the Rosenberg case. Gordon Dean, the chairman of the Atomic Energy Commission, said: "It looks as though Rosenberg is the kingpin of a very large ring, and if there is any way of breaking him by having the shadow of a death penalty over him, we want to do it." Myles Lane, a member of the prosecution team, said that the case against Ethel was "not too strong", but that it was "very important that she be convicted too, and given a stiff sentence." FBI director J. Edgar Hoover wrote that "proceeding against the wife will serve as a lever" to make Julius talk.
Their case against Ethel was resolved 10 days before the start of the trial, when David and Ruth Greenglass were interviewed a second time. They were persuaded to change their original stories. David originally had said that he had passed the atomic data he had collected to Julius on a New York street corner. After being interviewed this second time, he said that he had given this information to Julius in the living room of the Rosenbergs' New York apartment. Ethel, at Julius's request, had taken his notes and "typed them up." In her second interview, Ruth expanded on her husband's version:

Julius then took the info into the bathroom and read it and when he came out he called Ethel and told her she had to type this information immediately ... Ethel then sat down at the typewriter which she placed on a bridge table in the living room and proceeded to type the information that David had given to Julius.

As a result of this new testimony, all charges against Ruth were dropped. On August 11, Ethel testified before a grand jury. For all questions, she asserted her right to not answer as provided by the U.S. Constitution's Fifth Amendment against self-incrimination. FBI agents took her into custody as she left the courthouse. Her attorney asked the U.S. commissioner to parole her in his custody over the weekend so that she could make arrangements for her two young children. The request was denied.
Julius and Ethel were put under pressure to incriminate others involved in the spy ring. Neither offered any further information. On August 17, the grand jury returned an indictment alleging 11 overt acts. Both Julius and Ethel Rosenberg were indicted, as were David Greenglass and Yakovlev.

Trial and conviction

The trial of the Rosenbergs and Sobell on federal espionage charges began on March 6, 1951, in the U.S. District Court for the Southern District of New York. Judge Irving Kaufman presided over the trial, with Assistant U.S. Attorney Irving Saypol leading the prosecution and criminal defense lawyer Emmanuel Bloch representing the Rosenbergs. The prosecution's primary witness, David Greenglass, said that he turned over to Julius a sketch of the cross-section of an implosion-type atom bomb. This was the "Fat Man" bomb dropped on Nagasaki, Japan, as opposed to a bomb with the "gun method" triggering device used in the "Little Boy" bomb dropped on Hiroshima.
On March 29, 1951, the Rosenbergs were convicted of espionage. They were sentenced to death on April 5 under Section 2 of the Espionage Act of 1917, which provides that anyone convicted of transmitting or attempting to transmit to a foreign government "information relating to the national defense" may be imprisoned for life or put to death.
Prosecutor Roy Cohn later claimed that his influence led to both Kaufman and Saypol being appointed to the Rosenberg case and that Kaufman imposed the death penalty based on Cohn's personal recommendation. Cohn would go on later to work for Senator Joseph McCarthy, appointed as chief counsel to the investigations subcommittee during McCarthy's tenure as chairman of the Senate Government Operations Committee. In imposing the death penalty, Kaufman observed that he held the Rosenbergs responsible not only for espionage but for American deaths in the Korean War:

I believe your conduct in putting into the hands of the Russians the A-bomb years before our best scientists predicted Russia would perfect the bomb has already caused, in my opinion, the Communist aggression in Korea, with the resultant casualties exceeding 50,000 and who knows but that millions more of innocent people may pay the price of your treason. Indeed, by your betrayal you undoubtedly have altered the course of history to the disadvantage of our country.

The U.S. government offered to spare the lives of both Julius and Ethel if Julius provided the names of other spies and they admitted their guilt. The Rosenbergs made a public statement: "By asking us to repudiate the truth of our innocence, the government admits its own doubts concerning our guilt... we will not be coerced, even under pain of death, to bear false witness."