[6][7] Harun Mwau has been cited as one of "the more powerful and active narcotics traffickers in the region" by the Director of the Office of Foreign Assets Control of the US Department of Treasury.
[8] Harun Mwau has been denying the charges[6][8] and says that the United States government is attempting to seize his businesses, which are estimated to be worth $750 million.
[9] In 2005, Harun Mwau sued the Nation Media group for an alleged defamatory article which implicated him in a tax evasion scandal.
[11] In 2011, Harun Mwau sued the United States Ambassador Michael Ranneberger for associating him to narcotic drug trafficking.
[15] The same year, he sued the Kenyan Independent Electoral and Boundaries Commission for "intending to conduct a fresh presidential election without nominations".