> The Mulford Act is a 1967 California statute which prohibits public carrying of loaded firearms without a permit.[2] Named after Republican assemblyman Don Mulford and signed into law by governor of California Ronald Reagan, the law was initially crafted with the goal of disarming members of the Black Panther Party, which was conducting armed patrols of Oakland neighborhoods in what would later be termed copwatching.[3][4] They garnered national attention after Black Panthers members, bearing arms, marched upon the California State Capitol to protest the bill.[5][6]

https://en.wikipedia.org/wiki/Mulford_Act

Just to add color to your comment. These folks were directly exercising 2nd amendment rights against oppressive state forces and that Act was the response to them exercising it.