Chinese social network and gaming giant Tencent has fired 70 employees over bribery and embezzlement and blacklisted 13 firms last year as part of an anti-graft campaign.

Tencent’s anti-graft department found 50 cases involving bribery and embezzlement last year, and reported at least 10 of those case to police for suspected criminal offences, Tencent said in a social media post on Tuesday.

In addition, Tencent blacklisted 13 firms which have involved in these cases.

In its statement, Tencent detailed 16 cases, including some fired employees took bribes from suppliers, profited from using a company they controlled to enter a deal with Tencent, and took advantage of their positions to receive money paid by job candidates.

To be more specific, a former team leader in Tencent’s content marketing department took advantage of his position to sign a deal with Tencent by using a company he personally controlled.

In addition, a former employee from Tencent’s digital music department accepted bribes from suppliers, and other fired employees posted fake internship opportunities online and received money from candidates.

Tencent started its anti-graft campaign in 2019 and has been regularly reporting the results of its probes. In 2020, Tencent blacklisted 37 companies and fired 100 employees for accepting bribes.

Chinese tech companies have cracked down corruption in recent years as their business scaled up and expanded beyond its core as well as profiles have soared following a tech boom in the country.

Yang Weidong, the president of Alibaba’s video streaming service Youkou, stepped down before he was given a seven-year jail sentence.

An Bang, a 31-year old Baidu senior engineer who joined the company’s search operations and maintenance department, installed crypto mining scripts- a mining system that instruct servers to mine cryptocurrency- on 200 of Baidu’s servers between April and July 2018, allowing him to use the company’s computing power to freely mine cryptocurrency including Bitcoins and Monero.

As a result, the Baidu engineer has been sentenced to three years in prison.