Section 3. Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.The USSR was The Evil Empire, but it was our ALLY in War. Thus the Rosenbergs were NOT guilty of treason as the Constitution clearly spells it out.The Congress shall have power to declare the Punishment of Treason ...
Now Jane Fonda, John Kerry -- they WERE traitors under the Constitution's definition.
The Rosenbergs were not charged with treason. They were charged with, and found guilty of, espionage.