Short answers, pulled from the story.
The Soviet government began moving millions of farmers labeled as kulaks to remote regions in 1930. These deportations marked the first time an entire social class was forcibly relocated under state orders.
Over 200,000 people were deported from Baltic states between 1940 and 1953 while Romanians from Chernivtsi Oblast numbered between 200,000 and 400,000 victims. This operation set a precedent for removing entire nationalities based on ethnicity rather than class.
On the 18th of May 1944, all Crimean Tatars were transferred en masse to distant parts of the Soviet Union as special settlers. Vyacheslav Molotov justified this decision by claiming mass treason occurred during the war despite official records showing only around 3,000 served in German battalions out of 183,000 total population.
Harsh climates combined with disease and malnutrition caused fatalities ranging from 800,000 to 1.5 million among deported populations. Work exploitation lasting up to twelve hours daily exacerbated suffering without adequate housing or food supplies.
The Supreme Soviet of Russia passed a law on the 26th of April 1991 denouncing all mass deportations as Stalin's policy of defamation and genocide. Article 2 recognized the right of repressed peoples to restore territorial integrity existing before unconstitutional border changes.