UPDATE 6-U.S. charges Russians with 2016 U.S. election tampering to boost Trump

WASHINGTON, Feb 16 (Reuters) - A Russian propaganda arm oversaw a criminal and espionage conspiracy to tamper in the 2016 U.S. presidential campaign to support Donald Trump and disparage Hillary Clinton, said an indictment released on Friday that revealed more details than previously known about Moscow's purported effort to interfere.