Sobell and Pollard, Can Someone Explain?

In a "Letter to the Editor" today, Morton Sobell clarifies aspects of his previous admission and states:-

As for me, I helped an ally (admittedly illegally) during World War II. I chose not to cooperate with the government in 1950. The issues are now with the historians. Morton Sobell, Bronx, Sept. 12, 2008

Sobell was arrested in August 1950 and in April 1951 was sentenced to 30 years imprisonment for the crime of spying for the Soviet Union, then an enemy of the United States, of conspiracy to commit wartime espionage, by handing over to his handlers sensitive military material. In 1969, Sobell is released from jail. He did not cooperate with the trial proceedings and never testified, either against or for the Rosenbergs or himself.

Total time behind bars: 19 years.

As regards the Rosenbergs, I found this:-

The Rosenbergs' death sentences were reported as the first under the Espionage Act of 1917, which imposes death as a maximum penalty for espionage in wartime. In peacetime the maximum penalty would be twenty years' imprisonment.

Now, consider this -

Jonathan Pollard was arrested in late 1985 and sentenced to life imprisonment in March 1987 for the crime, on behalf of an ally, of aiding Israel, not during wartime needless to note. He had entered into a plea agreement, cooperating fully with the prosecution yet his life sentence, with a recommendation that he never be paroled was in violation of the plea agreement he had reached with the government.

Jonathan Pollard was never indicted for harming the United States nor was he ever indicted for compromising codes, agents, or war plans or charged with treason in that he ever spied for an enemy state in time of war.

Jonathan Pollard was indicted on only one charge: one count of passing classified information to an ally, without intent to harm the United States.

Court of Appeals Judge Stephen Williams called the case "a fundamental miscarriage of justice" and wrote that he would have ordered that Pollard's sentence be vacated.

So, tell me, why is Jonathan Pollard still in jail 21 years

after being sentenced? What is the difference in the leniency

granted Sobell and the cruelty displayed to Pollard?

What am I missing here?