Chaim Weizmann Zionist activity, and executed in 1939. His fate became known to his wife and children only in 1955. Maria Weizmann was a doctor who was arrested as part of Stalin's fabricated "Doctors' plot" in 1952 and was sentenced to five years' imprisonment in Siberia. She was released following Stalin's death in 1953, and was permitted to emigrate to Israel along with her husband in 1956. Weizmann was married to Vera Khatzmann. The couple had two sons. The younger one, Flight Lieutenant Michael Oser Weizmann (1916–1942), fought in the Royal Air Force during World War II. While serving as a pilot
Chaim Weizmann Nobel Prize laureate Fritz Haber, but took over the directorship himself after Haber's death en route to Palestine. During World War II, he was an honorary adviser to the British Ministry of Supply and did research on synthetic rubber and high-octane gasoline. After the Second World War, a Jewish group called Nakam formulated several plans to kill Germans in revenge for the Holocaust. Nakam's leader Abba Kovner, a former Lithuanian partisan, testified that he had approached Weizmann (at that time, President of the World Zionist Organization) with plans for a mass poisoning and that Wiezmann had put him in touch