Izo was a gun dealer specializing in rare, high specification automatic guns. He supplied these weapons to the replicants in addition to firearms obtained by Lieutenant Edison Guzza. He was also involved in selling Off-world weapons to replicants and crooks.
Izo was a member of a replicant sympathizer group prior to becoming a felon.
After Blade Runner Ray McCoy pursued Izo, Crystal Steele arrested or shot him for being involved in the bombing of the Tyrell Manufacturing Plant near the protesters at the Citizens Against Replicant Slavery rally.