打黑 + 薄 (smash the black / dǎhēi + the surname for Bo Xilai / bó) is a reference to Bo Xilai's 2009-2011 campaign to rid the city of Chongqing of organized crime. In Chinese, it's known as "重庆打黑除恶专项行动" (literally, Chongqing's fight against illegal activities and elimination of evil forces special operation) and it's also referred to as the Chongqing gang trials in English.
Why it is blocked: Chongqing is a sprawling major city in China's interior, home to nearly 30 million people in an area the size of South Carolina. Before Bo Xilai's arrival in Chongqing as party secretary (the de facto head of the city), organized crime was endemic in the city, with gangs running illegal underground activity and bribing police and government officials at all levels.
When Bo took office, he vowed to tackle organized crime and corruption and gave his police chief, Wang Lijun great latitude in attacking the problem.Thousands were arrested and Bo was celebrated for his seemingly successful triad busting. However, numerous questions have arisen about the way those arrests and convictions were made, with the most notorious being the case of Li Zhuang. Li, a much respected lawyer, defended some of those arrested in the crackdown, earning the wrath of authorities. One of whose clients was forced to falsely testify against him in an obvious frameup, and Li was convicted and imprisoned.
Since then of course, Bo and his police chief have experienced a spectacular fall from grace and the afterglow of busting the triads has been lost amid stories about tortured witnesses and false confessions. It was claimed that Bo and his associates even extorted rivals by threatening to target them next. Bo was recently convicted and sentenced to life in prison for numerous crimes, including those related to his handling of the crackdown in Chongqing, and Wang Lijun was sentenced to 15 years for abuse of power in his role in the campaign.
Note: Searching for 大黑 or 薄 on its own is ok, but if you have both words in your search query, it will be blocked. (The plus is not necessary.)
