A scandal implicating HSBC in alleged tax evasion widened further Wednesday, as Swiss prosecutors raided the Geneva headquarters of its private bank in Switzerland. The raid, in connection with an investigation into 'aggravated money-laundering', marks the latest twist in a saga that dates back 10 years. Materials leaked to the International Consortium of Investigative Journalists ... indicated that HSBC aggressively marketed schemes suitable for tax evasion to rich clients across the world. The materials come from a stash of files stolen from HSBC by Herv Falciani, a former employee and whistleblower. Falciani was indicted in Switzerland in December for industrial espionage and for breaking the law on banking secrecy. Falciani's files have already led to criminal investigations in France, Belgium and Argentina. The Swiss authorities' action Wednesday, however, is the first to suggest that they regard tax evasion itself as a bigger crime than exposing it. [HSBC has also recently] been found guilty of manipulating benchmark interest and foreign exchange rates, [and] desperately needs to be able to prove that it has not aided or abetted tax evasion or money-laundering since December 2012. That was when it signed a deferred prosecution agreement with the U.S. after admitting to helping Iran get round sanctions and laundering the profits of Mexican drug trafficking gangs. Any evidence that it has broken that DPA could lead to it losing its all-important license to bank in the U.S., destroying its status as a global bank overnight.