Sandarmokh

SandarmokhMar
By Semenov.m7 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=28444346
Sandarmokh is a mass graveyard in the the Karelian forest. It was a site for mas executions and burial of victims of Stalinist purges.

My granduncle Nils and Elvira Filpus, as part of their union activities, joined the Communist party while working in Detroit. In the early 1930's, the Soviet Union offered incentives to ethnic Finnish Communists to settle in Karelia SSR. The family emigrated in 1933. 
In 1933, the Stalinist Secret Police become distrustful of the non-native Finns. They were arrested en masse and convicted of trumped up treason charges. They were taken out to the Sandermokh forest, where they were forced to dig mass graves and then were executed.

Also executed at Sandarmokh were

Sandarmokh in Wikipedia