Hong Kong’s expulsion of a British journalist after he led a foreign correspondents’ meeting with a pro-independence activist is, first and foremost, an attempt by Beijing to tamp down any dissent in the former British colony.

Hong Kong officials have not given a reason for rejecting a journalist visa for Victor Mallet, the Asia news editor for The Financial Times. China’s only comment has been that Hong Kong authorities are within their right to do so. But that’s the typical legalistic evasiveness of authoritarian regimes when they do something they know is hard and embarrassing to defend.

The authorities have never criticized Mr. Mallet’s reporting. But he was the main spokesman for the Hong Kong Foreign Correspondents’ Club in August when it hosted a talk by Andy Chan, head of a political party that called for Hong Kong’s independence from China. Hong Kong and Beijing officials blasted the event in advance and subsequently banned the party.

Beijing took back control of Hong Kong from the British in 1997 after nearly a century of colonial rule, and agitation toward independence has never pleased China’s leadership. Hong Kong as an “inalienable” part of China is written into the territory’s Basic Law.