Occupation of Iran in World War 2

In September 1943, Iran declared war on Germany, thus qualifying for membership in the United Nations. In November at the Tehran Conference, Roosevelt, Churchill, Stalin reaffirmed a commitment to Iran's independence and territorial integrity and a willingness to extend economic assistance to Iran. However, soviet interference, in the form of the communist Tudeh Party, which was especially active in organizing industrial workers, continued to trouble Iran.  With the political controls of the Reza Shah period removed, meanwhile, party and press activity revived.