Feb. 2 (UPI) -- China executed another four people Monday for murder, kidnapping and drugs and sex trafficking offenses as part of a campaign tackling online scam centers in neighboring Myanmar manned by a captive workforce of modern-day slaves, including thousands of Chinese citizens.

The four, all leading members of the Bai mafia gang, were executed Monday in Guangdong after the province's High People's Court and Supreme People's Court rejected their appeal against death sentences handed down in November, the state-run Xinhua news agency said.

The Supreme Court ruled the sentences were commensurate with the "extremely egregious nature" of the $4.2 billion wire fraud and illegal gambling empire they ran out of dozens of compounds in Myanmar's Kokang province that caused the deaths of six Chinese citizens and injured several others.

Bai Yingcang, Yang Liqiang, Hu Xiaojiang and Chen Guangyi were convicted of homicide, assault, extortion and forcing people into organized prostitution alongside Bai Suocheng, the Godfather of the group, who had died of natural causes in the meantime.

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