Zuma became embroiled in a corruption controversy, one of many, after his financial advisor, Schabir Shaik, was charged with corruption and fraud. Bulelani Ngcuka, the national director of Public Prosecutions at the time, investigated both Zuma and the Chief Whip of the ANC, Tony Yengeni, after allegations of abuse of power were levelled against them. This concerned improper influence in the controversial arms deal, and the question of financial benefit as a result of such influence. While Yengeni was found guilty, the case was dropped against Zuma, with Ngcuka stating, "...that there was prima facie evidence of corruption, but insufficient to win the case in court."