In 1949, an assassin attempted to kill the Shah. Shocked by the experience and emboldened by public sympathy for his injury, the Shah began to take an increasingly active role in politics. He quickly organized the Iran Constituent Assembly to amend the constitution to increase his powers. He established the Senate of Iran which had been a part of the Constitution of 1906 but had never been convened. The Shah had the right to appoint half the senators and he chose men sympathetic to his aims. Mosaddegh thought this increase in the Shah's political power was not democratic; he believed that the Shah should "reign, but not rule" in a manner similar to Europe's constitutional monarchies. Led by Mosaddegh, political parties and opponents of the Shah's policies banded together to form a coalition known as the National Front. Oil nationalization was a major policy goal for the party.