Ukraine wary of KGB terror files
But the move to expose Soviet-era abuses is dividing Ukrainians, the BBC's Gabriel Gatehouse reports from Kiev.
Mr Viatrovych and his team are helping people to find out what happened to relatives and loved ones, often decades after they disappeared.
But the Ukrainian Security Service (SBU), now in charge of the files, is declassifying them selectively.
But not all young Ukrainians have an exclusively negative view of their 20th-Century history.
In Kiev, there is a vast monument to the Soviet victory over Nazi Germany: a sprawling bronze relief of soldiers bearing guns and bayonets.
"We love our history," said Svitlana, a young schoolteacher from the southern city of Odessa, on an outing with her class.
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