It took them 50 years to issue a proclamation, but no pardon, for Nicola and Bart, after mounting evidence, that neither of the two committed murder. Even then, the two were never pardoned. I highly doubt that the same kind of mercy would be extended to Ethel Rosenberg.
Sometimes, I am not sure if I am a leftist, or if I am a person with empathy, and an unwillingness to see people suffer... who happens to live in a capitalist system.
Perhaps psychological records/background checks to determine if they were bullies? Those should also be a thing before someone becomes a cop.