LONDON — Tens of thousands of people are expected to descend on Britain’s capital on Saturday for the largest far-right rally in decades, organized by anti-immigration activist Tommy Robinson. The “Unite the Kingdom” rally comes amid a surge of nationalism in the U.K., the rise of a far-right party topping the polls, and the murder of American conservative activist Charlie Kirk — an assassination Robinson has used to mobilize support in the run-up to the event.

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