The Soviet Georgian government, established after the Red Army invasion of Georgia in 1921, created the South Ossetian Autonomous Oblast in April 1922 under pressure from (the Caucasian Bureau of the Central Committee of the Russian Communist Party). Some historians believe that autonomy was granted to the Ossetians by the Bolsheviks in return for their assistance in fighting against independent Georgia, since this territory had never been a separate entity. Ossetians moved in large numbers to Tskhinvali, which used to have a larger population of Jews and Armenians than of Ossetians. North and South Ossetia were linked for the first time only in 1985 when the Roki Tunnel was opened.