In 1918, Capone met an Irish girl named Mae Coughlin at a dance. On December 4, 1918, Mae gave birth to their son, Albert Francis. Al and Mae married that same year on December 30th. Capone's first arrest was on a disorderly conduct charge after Capone hospitalized a rival gang member. Frankie Yale sent him to Chicago until things cooled off. Capone arrived in Chicago in 1919 and moved his wife and son, and several members of his immediate family into a house at 7244 South Prairie Avenue.
Once in Chicago, Capone went to work for Yale's old mentor, John Torrio, who also became godfather to his son. Torrio saw Capone's potential, his combination of physical strength and intelligence, and took him under his wing. In January 1920, the 18th Amendment of the Prohibition Act came into force, which made the brewing, distilling and distribution of alcohol completely illegal. The era of Prohibition was underway, and Chicago's criminal underworld, including Johnny Torrio who was prepared to make bootlegging alcohol a very profitable business. Around the end of 1920 Capone's father tragically died, but Capone was doing well in Chicago venture and did not go astray. At just 22