But a drumbeat of government security measures, including a broadening of counterespionage laws, and unannounced visits by investigators to the Chinese offices of several foreign firms have sent a shiver of worry that under Xi Jinping, economic pragmatism could again give way to a heightened focus on state control. International consulting and advisory firms are among those that have faced questioning from Chinese security officers in recent weeks, adding to fears among foreign investors that the authorities may be trying to choke off their access to unvarnished information about markets, competitors and potential deals in China. The scrutiny has left some companies questioning whether their China operations are at risk. Officers visited the Shanghai office of Bain & Company, a major American consulting firm, and questioned employees, Bain said in late April. And the Mintz Group, an American company specializing in corporate investigations, said in late March that officials visited its Beijing office and detained five Chinese employees.

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