The Bloods formed from the Piru gang on 1972 at Centennial High School, taking the Piru Bloods name from "Piru" street in Compton, California. The group formed to protect members from the Crips. Other gangs with the same motive started using the Pirus’ and Bloods’ names to signify alignment with the main gang. Although the Bloods’ membership is smaller than the Crips, they are potentially more dangerous, particularly when present in numbers.

They most often identify with the color red. West coast gang members often use a red bandana and while on the East Coast they use red colored beads. They will also use various graphic styles and terms emphasizing a disrespect for Crips.

Although many of the group’s traditional trademarks and identifiers have remained the same, their allies and enemies change drastically depending on their geographic location. There have been several occasions in which the Crips and Bloods have aligned with other gangs for a common cause or goal. They are currently aligning with the Black Gangster Disciples and Black Guerilla Family.

The Bloods present a significant threat to law enforcement officers not only due to their predatory and violent behavior, but more importantly, due to their intense rivalry with the Crips. Both the Crips and the Bloods have a strong fascination with assault-type weapons.(Knowgangs.com)