On both the Capone and Lindbergh cases the lead agent was Frank J. Wilson, who later took over as Chief of the Secret Service and supervised the 1933 double eagle case.

On Agent Mike Malone
Regarding Malone, here is how Wilson described him in his autobiography "Special Agent":

On the Lindbergh Kidnaping
Frank Wilson was the man who suggested recording the serial numbers of the ransom ("A dozen of [J.P.] Morgan Company's bookkeepers stayed up most of the night recording...."). The kidnapper stipulatedthe ransom ($50,000) be $25,000 in $20s; $15,000 in $10s; and $10,000 in $5s.

Regarding the gold notes: "We purposely included $25,000 in gold certificates, because there were fewer of these bills in circulation and they could be spotted by bank tellers much more easilythan other types of bills." (p. 61)

These guys were all pretty amazing. Wilson shortly after the Lindbergh case took over the Secret Service (1936).

To read the complete article, see:
TREASURY LAW ENFORCEMENT ON STRANGE INHERITANCE (http://www.coinbooks.org/v21/esylum_v21n06a22.html)