Chaim Weizmann institute was a global success attracting scientists from all over the Diaspora. In 1949 there were 20 researchers, twenty years later there were 400 and 500 students. The Honourable Chaim Weizmann met with United States President Harry Truman and worked to obtain the support of the United States, they discussed emigration, for the establishment of the State of Israel. The President lived at Rehovot, where he regularly received the Prime Minister David Ben-Gurion into his garden. He was denied any actualisation of the political role he had hoped for by the Left. He had to be consoled with the Weizmann
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