William Henry Parker III was an American law enforcement officer who was Chief of the Los Angeles Police Department (LAPD) from 1950 to 1966. To date, he is the longest-serving LAPD police chief. Parker has been called "Los Angeles' greatest and most controversial chief of police". The former headquarters of the LAPD, the Parker Center, was named after him. During his tenure, the LAPD was known for police brutality and racism; Parker himself was known for his "unambiguous racism".

The Watts riots, sometimes referred to as the Watts Rebellion or Watts Uprising, took place in the Watts neighborhood and its surrounding areas of Los Angeles from August 11 to 16, 1965. The riots were motivated by anger at the racist and abusive practices of the Los Angeles Police Department, as well as grievances over employment discrimination, residential segregation, and poverty in L.A.