Beijing claims an American citizen jailed for life in China earlier this year is a decorated spy who had worked for US intelligence for more than three decades, as it ramps up a campaign warning citizens to guard against foreign espionage. American jailed for spying by China is a veteran pro-Beijing advocate who rubbed shoulders with senior Chinese officials, CNN reporting shows CNN has previously revealed that Leung was a veteran leader of several pro-Beijing groups in the Houston area, who had rubbed shoulders for years with senior Chinese officials. The Chinese embassy in London dismissed the spying accusation as “completely fabricated