Chinese authorities are causing concerns for foreign companies in the country with a series of arrests and investigations. Foxconn, Apple's main partner and one of the largest employers in China, is being audited for taxes and land use. WPP executives have also been arrested, and a Japanese metals trading company employee and an Astellas Pharma executive have been detained. The opaque approach to regulation in China is unsettling foreign executives, as they are left guessing about the government's ultimate goals.