a nationwide Internet Cleaning-up Campaign (净网行动) was implemented, during which there was a widespread deletion of blogs containing views deviating from those of the Party. That same month in 2013, the government also made a concerted attack against "Big V's" (verified social media celebrities with large public influence) who had a history of online activism and rumor-mongering. Yang Qiuyu, Zhou Lubao, and Qin Huo Huo are three "Big V's" that were arrested between 21 and 23 August 2013 on charges of rumormongering and slander. In that same month, Chinese-American investor Charles Xue (Xue Manzi), one of the most popular liberal social commentators on Chinese social media, was also arrested. Three weeks after his arrest, he appeared on CCTV-1 (a Chinese TV channel), confessing that he "irresponsibly posted rumors about political and social issues online," and commending the new internet regulations passed under General Secretary Xi Jinping's administration. These arrests served as an example to the rest of the "Big V's" as well as other Chinese internet users to be careful of what they expressed online; in fact, even five months after these arrests in August, there was a noticeable decrease in the number of posts and discussions from prominent online figures. On popular microblogging site Weibo, opinion leaders decreased their posts by around 40% from the previous year. By 2015, instances of censored posts from popular Weibo accounts included messages that were only mildly critical of the government – for example, the blocking of sarcastic comments in the wake of a widely viewed documentary about urban air pollution in China entitled, Under the Dome (). From 2017 onwards, Chinese censors began removing all images of the character Winnie the Pooh in response to the spread of memes comparing General Secretary Xi Jinping to the plump bear, as well as other characters from the works of A.A. Milne, later leading to the film Christopher Robin being denied release in China. The Chinese government also employs people as "black PRs" to remove information from the Internet and criticize those who speak negatively about the government. Network operators are obligated by the Cyberspace Administration to assist the government in monitoring and removing "illegal information" online. Moreover, the Cybersecurity Law that went into effect on 1 June 2017 forces internet providers to identify internet users, facilitating control and monitoring of public expression online. The State Council has the right to cut off network access