I lived in SF from 2014 to 2020. Lived in Soma, the Mission, and the Haight. I saw a lot of really sad and disturbing things but I never saw or heard of a whole

I lived in SF from 2014 to 2020. Lived in Soma, the Mission, and the Haight. I saw a lot of really sad and disturbing things but I never saw or heard of a whole city block being barricaded by gangs of criminals. Where was that?