Barbary coast has 3 different meanings across 2 categories:
a part of a city that is notorious for gambling dens and brothels and saloons and riotous night life (especially the waterfront of San Francisco after the gold rush of 1849)
"we'll tolerate no Barbary Coast in this city!"
the Mediterranean coast of northern Africa that was famous for its Moorish pirates
The Mediterranean region off the coast of North Africa, once notorious as a haven for pirates