Before the announcement of the Molotov-Ribbentrop Pact, Western communists challenged the signing of such a treaty. Herbert Biberman, a future member of the Hollywood Ten, denounced the rumors as “fascist propaganda.” Earl Browder, the leader of the American Communist Party, said earl Browder was just as likely to be elected president of the Chamber of Commerce.  However, Gunther wrote that some knew that “communism and fascism were more closely allied than was usually understood,” and Ernst von Weizs-cker had declared on 16 August to Nevile Henderson that the Soviet Union would “participate in participation in Polish loot.”  In September 1939, the Communist International suspended all anti-Nazi and anti-fascist propaganda and declared that war in Europe was a matter of capitalist states attacking each other for imperialist purposes.  Western communists acted accordingly; Although they had previously supported collective security, they have now denounced Britain and France for going to war.  On 25 August, Hitler was surprised to see Britain join a defence pact with Poland.  Hitler postponed his plans to invade Poland on 26 August to 1 September.   In accordance with the defence pact, Britain and France declared war on Germany on 3 September.  The previous year, Hitler had annexed Austria and taken the Sudetenland to Czechoslovakia; In March 1939 its tanks rolled in the rest of Czechoslovakia. He seemed determined to reverse the international order created by the Treaty of Versaille, the 1919 peace settlement, which ended the First World War (1914-18). (The treaty, which required Germany to make numerous concessions and reparations, was very unpopular with Hitler and his NSDAP.) It also seemed that Hitler was planning to strike his neighbour, Poland.
To block it, France and Great Britain pledged on 31 March 1939 to guarantee Poland`s security and independence. The British and French also strengthened their diplomatic engagement with the Soviet Union and tried to bring them closer together through trade and other agreements, to see Hitler that he would also have to face Joseph Stalin if he invaded Poland. But Hitler already knew that the Soviets would not stand idly by if he occupied Poland – an act that would extend Germany`s border to the Soviet Union. He also knew that France and the Soviets had entered into a defence alliance a few years earlier – a treaty that gave Stalin an additional reason to fight Germany when it ventured into Poland and raised France`s promises. As recently as 1939, it seemed highly unlikely that the United States and the Soviet Union would forge an alliance. U.S.-Soviet relations had increased considerably after Stalin`s decision to sign a non-aggression pact with Nazi Germany in August 1939. The Soviet occupation of eastern Poland in September and the “winter war” against Finland in December led President Franklin Roosevelt to publicly condemn the Soviet Union as a “dictatorship as absolute as any other dictatorship in the world” and impose a “moral embargo” on the export of certain products to the Soviets. However, despite strong pressure to sever relations with the Soviet Union, Roosevelt never lost sight of the greatest threat to world peace from Nazi Germany, not the Soviet Union. To overcome this threat, Roosevelt said he would “hold hands with the devil” if necessary. The original German Secret Protocols was probably destroyed in the bombing of Germany, but by the end of 1943 Ribbentrop had filmed the secretest recordings of the Foreign Ministry in microfilm from 1933, for an amount of about 9,800 pages.