Some corrections are in order:
“And yet much of the left insisted on approaching the war in just that fashion, and had Hitler not attacked Stalin, it might have remained stuck there.”
The USSR assisted NAZI Germany in its efforts to rebuild the German armed forces, particularly the Luftwaffe, by making its territory and Soviet armed forces available for secret training to circumvent the World War One Armistice terms. During the Second World War, amny German officers who served in the Soviet Union with Soviet commissions and enlistments to circumvent the WWI Armistice were tried for treason against the Soviet Union and executed rather than being retained as prisoners of war (POWs).
Hitler changed his schedule for the invasion of the Soviet Union and postponed further attempts to invade Britain because he became aware of Stalin’s plans and preparations to abrogate the pact and invade through the Eastern Front while Germany’s forces were committed to the battles on the Western Front. Stalin was surprised and disbelieving of Churchill’s warnings about the coming German invasion because Stalin was already convinced that Hitler was comitted to the Western Front as the Soviet forces prepared to invade from the East.
“As soon as the war ended, the U.S. Left set about giving our secrets to the Soviets and doing everything they could to work against us.
“The Left was busy disgorging every bit of secret and non-secret information they could hand over to the Soviets before, during, and after the war. By Agreement, President Franklin Delano Roosevelt handed over tons of U.S. secret documents and weapons to the Soviets. U.S. military police and intelligence services were forbidden by President Roosevelt to inspect or interfere with in any way as the Soviets transported these vital resources out of the United States aboard aircraft and ships. When the U.S. Army Counter-intelligence Corps got to close to the Soveit espionage agents in the Roosevelt Administration and documented Eleanor Roosevelt’s extra=marital affairs, heterosexual and homosexual, he ordered their intelligence files to be destroyed and their units to be transferred to the European Theater of Operations (ETO). The commander of the counter-intelligence unit disobeyed the President’s orders and preserved those intelligence files, while other units complied and destroyed their files implicating Harry Hopkins and other Administration officials in the Soviet espionage. So, the breaches in U.S. security after the end of the war were business as usual for the American Left.
Events in the United Stats such as the Communist-led North American Aviation strike of 1941 lend credence to this argument. It is also true that prior to the German invasion of the USSR, the British Communist Party philosophically opposed its own government's war effort due to the Nazi-Soviet Pact being in place.
Stalin was planning his invasion for 43 or 44. He had absolutely no plans to attack in 41.