answer: they worked in support of American enemies during World War II
Explanation: it says it in the passage
It can be deduced that the thing that they both have in common is that they worked in support of American enemies during World War II.
World War II simply began in 1939 when Germany invaded Poland. This then led to France and Great Britain declaring war on Germany.
From the complete information, it can be inferred that thing that Pound and Stein both have in common is that they worked in support of American enemies during World War II.
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