In 1939, the FBI became pre-eminent in the field of domestic intelligence, thanks in large part to changed made by Hoover, such as expanding and combining fingerprint files in the Identification Division, to compile the largest collection of fingerprints to date.
The FBI became pre-eminent in the field of domestic intelligence, thanks in large part to changed made by Hoover. This was such as expanding and combining fingerprint files in the Identification Division. This was in 1939. This was to compile the largest collection of fingerprints to date.