Last year during sweeping British protests triggered by the stabbing murders of three young girls at a dance recital by the radicalized 17-year-old child of Rwandan migrants, London Metropolitan Police Commissioner Mark Rowley threatened to have American citizens "arrested and extradited" to the UK for "stoking racial violence" (i.e. pointing out that third world migrants and often the children of third world migrants are a societal net negative and should be deported). 

The event sparked a series of thousands of arrests of UK citizens for crimes as meager as posting memes online and hoisting British flags in the presence of immigrants.  In the past year at least 12,000 such arrests have been made in the name of "quelling hate speech", an ill defined violation based on arbitrary guidelines and left up the whims of leftist bureaucrats.