Pensioners and mothers with young children braved biting wind to queue in the shadow of the Lubyanka headquarters of the feared Soviet secret police -- which now houses Russia's FSB security service -- where they recited names and laid flowers at a modest monument.
"I came because my grandfather was arrested aged 40 and shot aged 44 in 1938," said Yelena Yermolayeva, 62, a physicist at Moscow State University, clutching a piece of paper she'd been handed with the names of three victims on it.
"I have come to understand that his death changed the fate of my entire family," she said.
The yearly event -- known as "Bringing Back Names" -- is organised by leading rights group Memorial and held on the eve of a national day commemorating those persecuted by the Soviet authorities.
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The names read out are among the tens of thousands shot under Stalin in Moscow alone from 1937-8, although the commemoration itself is for the many millions who died under Soviet persecution.
Some at Thursday's event -- which lasts from morning to evening -- lashed out at the government for sweeping Soviet-era atrocities under the carpet and called for a public condemnation of the crimes.
"Memory is very important -- we must educate children that under Stalin we didn't have good factories and 20 million were killed," said Irina Ilyina, 33, digging a picture of her grandmother's brother, who was executed in 1937, out of her handbag.