"We received this information because we were there," Wang said. "The letters of complaint have painted a portrait of the officials."

The inspectors knew that there must be reason why one company had received so many accusations. Further investigation discovered that former chairman of the company Xu Jianyi had taken advantage of his positions, both within the company and in local government, to help others with business contracts, promotions, and accepted bribes worth 12.19 million yuan (around 1.77 million U.S. dollars) from 2000 to 2013.

The documentary showed that some suspects were interrogated to provide information on other suspects. The investigation into Yang Zhenchao, former vice governor of east China's Anhui Province was a case in point.

In Huainan of Anhui Province, inspectors heard that Cao Zhengyong, who had previously worked with Yang, was under investigation for taking advantage of his positions to secure construction projects, and Yang had been accused of the same issues.

The inspectors interrogated Cao and got specific information on how Yang had illegally secured construction projects.

Since the 18th CPC National Congress, more than 60 percent of the investigations into centrally-administered officials were a result of information found by discipline inspectors, the documentary said.

INSPECTORS' COMEBACK

Some places were inspected twice and the return of the inspectors meant even more former officials were investigated.

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