Los Angeles has a long history of gang activity, with various groups emerging since the early 20th century. The most notable gangs include the Bloods and Crips, which formed in the 1970s and are known for their rivalry. These gangs often engage in criminal activities, including drug trafficking and violence, impacting local communities. In addition to the Bloods and Crips, other gangs like the MS-13 and 18th Street have also established a presence in Los Angeles. Law enforcement agencies work to combat gang violence through community programs and policing efforts, aiming to reduce crime and improve safety in affected neighborhoods.