June 1932, the Bonus Expeditionary Force, also known
as the "Bonus Army", marched on Washington, DC, to
advocate the passage of the "soldier's bonus" for
service during World War 1. After Congress adjourned,
bonus marchers remained in the city and became unruly.
On July 28, 1932, two bonus marchers were shot by
police, causing the entire mob to become hostile and
riotous. The FBI, then known as the United States
Bureau of Investigation, checked its fingerprint records
to obtain the police records of individuals who had
been arrested during the riots or who had participated
in the bonus march.