In 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.