In 1972, after a violent confrontation with his abusive father, Miklo Velka, a teenager of half-Mexican descent, leaves
Las Vegas for
East Los Angeles. He moves in with his cousins, Paco and Cruz, who are members of the
Vatos Locos gang. Miklo joins the gang following an attack on their rivals, the Tres Puntos. Tres Puntos retaliates by attacking Cruz, permanently damaging his back. When Vatos Locos counterattack the next day, Miklo kills Spider, the leader of Tres Puntos. Fleeing the scene, Paco crashes their car; both he and Miklo are arrested. The cousins' paths diverge: Miklo is imprisoned in
San Quentin for murder, Paco volunteers for military service in the
Marine Corps in lieu of prison, and Cruz continues his passion for art. Due to his back pain, Cruz becomes addicted to
heroin, leading to the accidental overdose of his 12-year-old brother, Juanito. After the Marines, Paco joins the
Los Angeles Police Department, eventually working as an undercover detective for them. Meanwhile, Miklo finds that San Quentin is run by three racially defined
prison gangs: the Black Guerrilla Army (BGA) led by Bonafide, the Aryan Vanguard led by Red Ryder, and
La Onda led by Montana Segura. Popeye, a high-ranking member of La Onda, tries to
rape Miklo at knifepoint but is stopped by Montana, who finds Popeye's intentions dishonorable. Miklo learns that the only way into La Onda is by killing an inmate from a rival gang. He forms a rapport with Aryan Vanguard associate Big Al, then kills him in the prison kitchen. Now initiated, Miklo rises through the La Onda ranks, eventually joining its Ruling Council. After serving nine years, Miklo is granted
parole. On the outside, disgusted by his menial job, he joins in an armed robbery. The heist goes poorly and Miklo is intercepted by Paco, who tries to persuade him to surrender his weapon and resolve the situation peacefully. Miklo instead starts to flee, and Paco shoots him in the leg. The leg is
amputated, and Miklo is sent back to prison. Miklo notices that
cocaine use is now rampant, driven by competing supplies from the BGA and La Onda council member Carlos. The Aryan Vanguard want to partner with Carlos as his supplier, offering to help Carlos take the BGA out of the cocaine business. Montana, against La Onda being in the drug trade, warns that the Aryans want to start a war between the Black and Chicano inmates. The Council votes in agreement with Montana, resulting in Carlos and some others leaving La Onda to work with the Aryan Vanguard. Carlos has his non-inmate brother, Smokey, bomb the BGA's stash house in the city. Carlos also kills "Pockets", who runs the BGA's operation in San Quentin. As Montana feared, the Aryan Vanguard then lets the BGA murder Carlos. With rising hostility between Blacks and Chicanos, Montana and Bonafide meet in the prison yard. Montana convinces Bonafide to agree to a truce if Montana reaches out to La Onda leaders in other prisons to end the violence. The warden grants Montana special permission to visit the prisons and Miklo is left in charge. Montana is granted a special request to have his daughter visit him at a prison. Before she arrives, he is stabbed to death by someone from the BGA. Believing the Aryan Vanguard sent forged orders to the hitman, Paco arranges a peace conference between La Onda and the BGA, but Miklo uses the talks to build an alliance with the BGA and plan the joint killing of Aryan Vanguard leaders. After the Aryans are killed, Miklo's men
double cross and murder the BGA leaders as well. Furious, Paco confronts Miklo, disowning him forever. The warden vows to split La Onda's ruling council by sending them to prisons in other states. Miklo uses this to expand La Onda across the
Southwest. It is later revealed that Magic, not the Aryan Vanguard, sent the forged orders to have the BGA kill Montana at Miklo's behest. As Miklo destroys the evidence of their betrayal, Magic swears his life to Miklo as his
jefe. In East Los Angeles, Paco visits one of Cruz'
murals, showing a portrait of his former life. In a pep talk with Cruz, Paco realizes that by ordering Miklo to go after Spider, Paco is responsible for what Miklo has become. He forgives Miklo, as well as himself. == Cast ==