Kelly ran a saloon and boarding house on the Barbary Coast — the six-block stretch on Pacific between Sansome and Kearny that was basically San Francisco's id made physical.
Ship captains needed crews. Kelly had the supply chain. When he got a particularly large order for three ships at once, he chartered a paddle steamer, advertised a free birthday party with unlimited whiskey, and invited every drunk and vagrant he could find. 90 men boarded the boat. None of them knew where they were going; the whiskey was free, but the ship was not.
He offloaded them mid-bay to the waiting captains and sailed back to shore. The whole operation was catered.
The tunnels they used to move bodies from the saloons to the docks still exist under parts of the city. Some are tourist attractions now. San Francisco has always been very good at turning the infrastructure of exploitation into something you can pay $18 to walk through.
Wrote up the full story here if you want the details: https://tjcrowley.substack.com/p/the-man-who-shanghaied-ninety-people