Many at that facilty were forced to work in the "Leper Colony" because they were suspected of spying (they had either gone to school with Julius Rosenberg or known Joel Barr and Al Sarant--spies who fled to the Soviet Union when the Rosenberg ring was cracked).
Over the decades, families and extended families have created mythologies about the evil McCarthy. That is the problem.
Dorothy Rabinowitz may not be related to the two men who testified. But she surely knows of them. Or of others. And she knows what their kids and their grandkids have been taught about McCarthy. The myth of innocent victims of a "witch-hunt" must be kept alive.