The Pirus or Piru Street Boys are a Los Angeles, California area street gang alliance (under the larger alliance, Bloods) based out of Compton which spread to Carson, Inglewood, and Watts.

This meeting eventually led to the formation of the Bloods.There are fifteen known Piru sets. Piru in current times is simply an alliance under an alliance. The Piru alliance is under the Blood alliance, in which the Piru alliance has street gang sets which have subsets.