If anyone's interested in a movie BASED on the Rosenbergs then I recommend 'Daniel'. It's told in 'repeated flashback' style with Timothy Hutton as the title character, the son of the 'Isaacsons/Rosenbergs', who are played by Mandy Patinkin and Lindsay Crouse.
'Daniel' is quite harrowing to watch as, eventually, we get to "see" the executions. Because it's a 'Mandy movie' I have it on video and will get the DVD when available (and I can afford it) but I don't watch it very often.
Trivia item: Early in the movie, Paul Isaacson (MP) is shown dancing around, holding 'baby Isaacson' at a gathering of family and friends. The baby is actually Mandy's own son, Isaac Grody Patinkin, who will be 22 this year!