In 1946, when these conductors were undergoing denazification – successfully in the case of Furtwängler, unsuccessfully in the case of Mengelberg – the orchestra was led primarily by conductors untainted by Nazi association, including Josef Krips, Erich Leinsdorf, Volkmar Andreae, Paul Paray, and Charles Munch. An exception was Herbert von Karajan, who made his debut with the orchestra with two concerts in January, but was unable to conduct a third scheduled concert when occupying authorities required him to undergo denazification (his tribunal in Vienna was in February, 1947). After clearance, he resumed conducting in late 1947 and developed a significant association with the orchestra (more below).