The normally conciliatory American Chamber of Commerce in China suggested last fall that China is using antitrust to zap foreign firms. It looked prescient when China last month fined Qualcomm Inc. nearly $1 billion for alleged abuse of market position, and forced costly changes to its

license model. Trade wars are old news, but this is something different. Are foreign direct investors now being caught in the cross-fire between U.S. and Chinese exporters?