Tens of thousands of people took part in a “Unite the Kingdom” rally in London, England, on Saturday, where demonstrators also honored Charlie Kirk with some holding pictures and banners of the late conservative activist. 

Organizers played a heartwarming tribute video to Kirk that included a viral clip of him giving life advice to a 13-year-old girl at a Turning Point USA event.

The rally was organized by activist Tommy Robinson, who said the video was shown to thank and “honor the life of one of our generation’s greatest.” Elon Musk also appeared via video link and condemned the left as “the party of murder” following Kirk’s death.

Supporters display a large photo of slain conservative activist Charlie Kirk as thousands marched in London at the “Unite the Kingdom” rally organized by Tommy Robinson. (Carl Recine/reuters)

“You see how much violence there is on the left, with our friend Charlie Kirk getting murdered in cold blood this week, and people on the left celebrating it openly,” Musk said. “The left is the party of murder.”

Robinson praised Musk for purchasing Twitter and lifting bans on right-wing commentators, saying Saturday’s event would not have been possible without him.

He added that the British public was “telling the world they’re ready to fight back,” linking that directly to Musk giving them a platform.

Robinson told the crowd in a hoarse voice that migrants now had more rights in court than the “British public, the people that built this nation.”

The marches come as the U.K. is riven by debate over migrants crossing the English Channel in overcrowded boats to arrive without authorization.

Musk warned of the dangers of stifling free speech and said the U.K. was at a critical point in its history.

A poster with Charlie Kirk’s image and the words “We stand together” is seen on a barricade as demonstrators rallied in London (Christopher Furlong/Getty Images)

“You can’t get to the truth without freedom of speech, without active debate… the essence of democracy is a government for the people, by the people.”

He added that the U.K. was in danger of losing its identity due to mass migration, accusing the BBC of being “complicit in the destruction of Britain.” He also claimed mass migration was being used to import new voters.

“I see a rapidly increasing erosion of Britain with massive, uncontrolled migration and a government that has failed in its duty to protect its citizens.”

“Britain is at a fork in the road — to darkness or greatness — and that will be decided only in a matter of years.”

Fox News’ Greg Norman and The Associated Press contributed to this report.