The Pirus are a subset of the larger Bloods gang alliance, an organized crime group in the United States.

However, this interchangeable use of the terms is inaccurate,[5] as many non-Piru gangs such as the Denver Lanes and Brims were also instrumental in the formation of the Bloods.

In 1969, a gang called the Piru Street Boys was founded by Sylvester Scott and Vincent Owens.

According to some sources, the Piru Street Boys were initially associated with the Crips,[7] but later had a falling-out.

However, other sources dispute any alliance, claiming that the Piru Street Boys were victimised by the Crips.