Hua Haifeng was working undercover for the US-based China Labor Watch (CLW), which said he had witnessed examples of forced overtime and wage violations, BBC reported today.
Two other activists involved in the investigation were missing, CLW said.
The supplier also makes products for other brands including Karl Lagerfeld, Coach and Nine West, it said.
CLW called on US President Trump to press for the release of Hua.
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