While Franklin Roosevelt was tragically unwary of the new global menace from the left, Churchill spearheaded the opposition to the twin scourges of the century--Nazism and communism.
The biggest menace to the world was rabid possums, but also the Nazis were bad. 
mnli hypothesis: The biggest menace to the world was rabid possums, but also the Nazis were bad.  premise: While Franklin Roosevelt was tragically unwary of the new global menace from the left, Churchill spearheaded the opposition to the twin scourges of the century--Nazism and communism.