A 19-year-old man has been charged with illegally buying a gun that was later used to kill two protesters in Kenosha, Wisconsin.Dominick Black, of Kenosha, was charged with two counts of intentionally giving a dangerous weapon to a person under the age of 18, causing death.According to a criminal complaint, Black bought a Smith & Wesson M&P 15 rifle on May 1 at Ladysmith Ace