During the war, the Wallenberg bank, Stockholms Enskilda Bank, collaborated with the German government. The Secretary of the US Treasury, Henry Morgenthau Jr. considered Jacob Wallenberg strongly pro-German, and in 1945, the US Federal Bureau of Investigation subjected the Bank to a blockade from engaging in business in the United States that was only lifted in 1947. Author Alan Lelchuk who interviewed, amongst others, Wallenberg's KGB interrogator, wrote a novel that imagines the more powerful of the family may have chosen not to use their influence to locate Raoul as it could have drawn attention to their misdeeds, and they may have considered him an embarrassment, not only for being a man of morality, but his possible homosexuality.