This is what I noticed...
I think it was obvious that Ivy found out her grandparents did do something against the US. Toward the end of this documentary, she, her father, uncle, and others kept saying "they weren't guilty of what they were charged with." Perhaps not, but they were guilty of committing traitorous acts against the US. It seems to me that Julius and Ethel gave their lives for communism. They were traitors to the US, but not traitors to their own conscience. They truly believed in communism and thought they were doing the right thing. Too bad they didn't live long enough to see what communism really was, and how it destroyed the people of the USSR.
And it's too bad the US has not kept communism/socialism from creeping into our government anyway. It has taken since about 1920 or 1930, but the US is inches away from becoming communist in every way but in name through dictatorial socialist judges.