For years, Zhou Lubao lived on the margins of China’s economy, earning the equivalent of about $512 per month as a construction site gatekeeper and sending most of it home to support his family.Now, the man in his 30s faces a potential prison sentence...

For years, Zhou Lubao lived on the margins of China’s economy, earning the equivalent of about $512 a month as a construction site gatekeeper and sending most of it home to support his family.Now, the man in his 30s faces a potential prison sentence...