How did prohibition contribute to the growth of organized crime?

Prohibition drove drinking "underground," so to speak. People opened secret illegal bars in basements, cellars, wherever they could find. It spawned criminal masterminds such as Al Capone, the father of organized crime

Prohibition obviously angered people because they were no longer able drink freely, so groups found ways to get around this by bootlegging, or illegally selling and distributing alcohol in speakeasies. The groups that mainly did this were newly created mobs and gangsters who rivaled with other mobsters.