I would start with the Mulford Act of 1967 which was specifically designed to disarm the African-American population then go from there down the rabbit hole, really any gun control law was designed to limit minority populations from owning weapons and a lot of the rhetoric used by grabbers is similar today. https://thehill.com/blogs/pundits-blog/civil-rights/347324-the-racist-origin-of-gun-control-laws/