By Jonathan Stempel and Chris Prentice NEW YORK/WASHINGTON (Reuters) - John McAfee, the antivirus software pioneer whose former company still bears his name, has been indicted on fraud and money-laundering conspiracy charges stemming from two cryptocurrency schemes, the U.S. Justice Department said on Friday. Authorities accused McAfee and his bodyguard, Jimmy Gale Watson Jr., of exploiting McAfee's large Twitter following to artificially inflate prices of "altcoins" through a so-called pump-and-dump scheme, and concealing payments McAfee received from startup businesses to promote initial coin offerings. The Justice Department said McAfee and his accomplices reaped more than $13 million from the schemes. The charges were brought in Manhattan federal court.