Roy Cho Kwai-chee, the alleged mastermind in Hong Kong’s largest financial investigation in decades, has been charged with conspiracy to defraud Convoy Global Holdings by the city’s securities regulator and anti-corruption investigator. Cho allegedly conspired to defraud Convoy and its affiliates, causing more than HK$89 million (US$11.3 million) in losses. He will be brought to the Eastern Magistracy today, according to a joint notice by the Securities and Futures Commission (SFC) and the…