in Yugoslavia organising the KPJ there as a disciplined covert organisation drawing new members loyal to the communist ideas and Tito personally from all nations within Yugoslavia, except Macedonians. During this period, Tito intervened in conflict among groups of KPJ members incarcerated in Sremska Mitrovica. The conflict centred on the popular front strategy advocated by Hebrang and supported by Moša Pijade, Josip Kraš, and Đuro Pucar and denounced by Petko Miletić backed by Milovan Đilas and Aleksandar Ranković – the latter labelled Wahhabites by Pijade because of their radicalism. The conflict escalated to an attempt to kill Hebrang. Tito worked with Pijade to arrange a compromise by including Đilas and Ranković in the temporary KPJ leadership along with Croatian moderate popular front supporters Kraš and Andrija Žaja as well as Soviet-educated Slovene Edvard Kardelj. In 1937, the Comintern compelled the KPJ to formally establish the Communist Party of Croatia (, KPH) and the Communist Party of Slovenia (). The two parties were nominally independent, but actually within the KPJ. This was later the precedent for establishment of communist parties in other parts of Yugoslavia. Still the KPH leadership headed by Kraš and Žaja came into conflict with Tito in 1938 when the KPH supported the HSS instead of the Party of the Working People as the KPJ front founded for participation in 1938 parliamentary elections. The temporary leadership put together by Tito remained largely unchanged when Tito received the Comintern mandate to lead the KPJ in 1939. Miletić was released from prison that year and sought to replace Tito. Months later he disappeared after he was summoned to Moscow and arrested by the NKVD as a victim of a series of purges in the KPJ in 1937–1940 which strengthened Tito's position. In 1940, the KPJ successfully completed the campaign to diminish influence of Krleža and his literary adherents who were advocating Marxist ideas and opposed Stalinisation fearing totalitarianism. Also, Tito removed Kraš and Žaja from the leading positions in the KPH and replaced them by Rade Končar. In October 1940, the Fifth Land Conference of the KPJ was held covertly in Zagreb, as the final act of Tito's campaign to assume full control of the party. The conference represented a full takeover of now organisationally stronger, centralized, disciplined, and bolshevized, but politically isolated KPJ by Tito in full alignment with the leftist line pursued by the Comintern at the time.