The Irgun declared an open revolt against British rule in Palestine. To assist in recruiting and propaganda efforts, Kook established the Hebrew Committee for National Liberation and the American League for a Free Palestine, both of which were involved in lobbying U.S. and other diplomats and in trying to attract the American public to support the Irgun's rebellion. Kook remained strongly affiliated with the Revisionist camp after the war during the creation of the State of Israel. While he was unquestionably loyal to the cause, his position as the Irgun's leading American activist was not free from conflict. In 1946 Kook received a letter from Menachem Begin, who had become chief of the Irgun in 1943. Begin admonished Kook for various policy positions that strayed from the official Irgun party-line. These included Kook focusing on the transportation of illegal immigrants to Palestine instead of a "primary" assignment - arms shipments to Irgun fighters, as well as a (rather common) usage of the term "Palestine". At the time Kook was in the habit of saying "Palestine Free State", which Begin thought left too much potential for bi-nationalism. Begin demanded that Kook refer to the future Jewish state as the "Free State of Eretz Israel".