What crime was the infamous gangster Al Capone finally convicted of?

Chicago’s most infamous Prohibition-era crime boss, Al Capone is best known for his violence and ruthlessness in his elimination of his rivals. On June 5, 1931, Capone was indicted for 22 counts of federal income-tax evasion for the years 1925 through 1929. On June 12 Capone and others were charged with conspiracy to violate Prohibition laws for the years 1922 to 1931. In October Capone was tried, found guilty on three of the 23 counts, and sentenced to 11 years in prison and $50,000 in fines and court costs.

Source: Britannica