Controversial Zimbabwean activist, William Mutumanje widely known as Acie Lumumba, who was fired just three days after his appointment as the Chair of Communication Taskforce in the finance ministry, has dismissed suggestions that he lost his position because of his tainted past. Speaking to his supporters on Facebook live this week, Lumumba said he was fired from his job because Finance Minister Mthuli Ncube believed he could be much "effective" outside of government.Watch video belowSoon after his appointment last week, Lumumba levelled allegations against four top Reserve Bank of Zimbabwe officials in a video posted on Facebook.Lumumba alleged the four - Mirirai Chiremba, Norman Mataruka, Gresham Muradzikwa and Azvinandawa Saburi - were part of a cartel controlling the allocation of foreign currency and bond notes to traders on the black market, according to the state-run Herald newspaper. * Sign up to News24's top Africa news in your inbox: SUBSCRIBE TO THE HELLO AFRICA NEWSLETTERFOLLOW News24 Africa on Twitter and Facebook. Central Bank Governor John Mangudya moved swiftly against the four suspending them indefinitely "to pave way for the investigations".Lumumba claimed the four bank officials worked with a woman he only named as "the Queen Bee"."Queen Bee has bought cars for the (top) guys at Zanu PF because she is struggling to capture (President Emmerson) Mnangagwa. So she decides to capture everyone else," he said, in quotes carried by NewsDay. In a dramatic change of events, an under fire Ncube fired Lumumba from his post.Lumumba, however, told his supporters that he did not get fired because he stole money from government or because of his tainted past, but the minister realised he was useful outside of government. "I understand why I was fired. I was fired for one reason and one reason only and that is because minister Ncube realised I would be more effective outside of government," Lumumba said."In the ministry I was limited, limited because I must liaise with permanent secretary. But now I can talk about what’s really going on without worrying about being fired. I am going to you some secrets about what’s really going on."