Why Ethel Rosenberg’s family is pushing for her exoneration

In 1953, Ethel and Julius Rosenberg were executed after being convicted as Soviet spies in a sensational Cold War espionage case. Now, a recently declassified document is seen as the strongest evidence yet of Ethel’s innocence. As Biden leaves office, he’s being asked to exonerate her and right a historic wrong. John Yang speaks with the Rosenbergs’ younger son, Robert Meeropol, for more.