A police riot is a riot carried out by the police; more specifically, it is a riot that police are responsible for instigating, escalating or sustaining as a violent confrontation. Police riots are often characterized by widespread police brutality, and they may be done for the purpose of political repression.

The 1968 Democratic National Convention was held August 26–29 at the International Amphitheatre in Chicago, Illinois, United States. Earlier that year incumbent President Lyndon B. Johnson had announced he would not seek reelection, thus making the purpose of the convention to select a new presidential nominee for the Democratic Party. The keynote speaker was Senator Daniel Inouye of Hawaii. Vice President Hubert Humphrey and Senator Edmund Muskie of Maine were nominated for president and vice president, respectively. The most contentious issues of the convention were the continuing American military involvement in the Vietnam War and voting reform, particularly expanding the right to vote for draft-age soldiers who were unable to vote as the voting age was 21. The convention also marked a turning point where previously idle groups such as youth and minorities became more involved in politics and voting.