Washington is waking up to the huge scope and scale of Chinese Communist Party influence operations inside the United States, which permeate American institutions of all kinds. China’s overriding goal is, at the least, to defend its authoritarian system from attack and at most to export it to the world at America’s expense. The foreign influence campaign is part and parcel of China’s larger campaign for global power, which includes military expansion, foreign direct investment, resource hoarding, and influencing international rules and norms. But this part of China’s game plan is the most opaque and least understood. Beijing’s strategy is...