James Cabell Bruce (December 23, 1892 – July 17, 1980) was a 20th-century American businessman and banker in New York City and Baltimore, who served as U.S. ambassador to Argentina in the 1940s.
From there, he traveled to the Balkans to investigate Albania and Montenegro for the Paris Peace Conference.
In 1926, Bruce moved to New York, where he worked for banks including Chase National.
However, Truman withdrew his offer, since brother David Bruce was already in line as U.S. ambassador to France.
[1] While ambassador, Bruce received a letter from attorney William L. Marbury, Jr., dated December 28, 1948.
In the letter, Marbury states, "there have been new developments in this case which would put to shame any respectable author of a detective story."