After the failure of forced collectivisation that was attempted from 1949 to 1953, a policy of gradual economic liberalisation, known as workers self-management, was introduced under the advice and supervision of the Slovene Marxist theoretician and Communist leader Edvard Kardelj, the main ideologue of the Titoist path to socialism. Suspected opponents of this policy both from within and outside the Communist party were persecuted and thousands were sent to Goli otok.