Half the deported perished, and the other half were not allowed to return until the early 1960s (years after Stalin's death).[citation needed] The activities of Soviet forces in 1940–41 and after reoccupation sparked a guerrilla war against Soviet authorities in Estonia by the Forest Brothers, who consisted mostly of Estonian veterans of the German and Finnish armies and some civilians. This conflict continued into the early 1950s. Material damage caused by the world war and the following Soviet era significantly slowed Estonia's economic growth, resulting in a wide wealth gap in comparison with neighbouring Finland and Sweden.