Julius Rosenberg was an engineer for the U.S. Army Signal Corps who was born in New York on May 12, 1918. His wife, born Ethel Greenglass, also in New York, on September 28, 1915, worked as a secretary. The couple met as members of the Young Communist League, married in 1939 and had two sons.
https://www.history.com/this-day-in-history/rosenbergs-executed
There was far more going on than just the Rosenbergs.
We just recently discovered that Oppenheimer’s mistress, Jean Tatlock really WAS a communist spy and she was actively recruiting other women to start relationships with other scientists.
Oppenheimer, the State Dept and the FBI all covered it up.
Grove and his military intelligence org discovered it.