Musician Chrissie Hynde performs for hundreds of activists fighting to stop the extradition of Julian Assange. Photo by Hugo Philpott/UPI | License Photo

Musician Roger Waters speaks to hundreds of activists fighting to stop the extradition of Julian Assange. Photo by Hugo Philpott/UPI | License Photo

Activists protest to stop the extradition of Julian Assange to the United States. Photo by Hugo Philpott/UPI | License Photo

Musicians Brian Eno (L) and Roger Waters (C) and politician Yanis Varoufakis walk in protest with hundreds of activists. Photo by Hugo Philpott/UPI | License Photo

Fashion designer Vivienne Westwood poses Saturday with a group of London activists fighting to stop the extradition of Julian Assange. Photo by Hugo Philpott/UPI | License Photo

The trial to extradite Julian Assange begins on Monday in London. Photo by Hugo Philpott/UPI | License Photo

Feb. 22 (UPI) -- Hundreds of supporters of Wikileaks founder Julian Assange gathered in London's Parliament Square on Saturday to protest his potential extradition to the United States.

Those present at the rally included Pink Floyd bassist Roger Waters, fashion designer Vivienne Westwood and former Greek Finance Minister Yanis Varoufakis.


Assange, 48, who founded Wikileaks in 2006, has been charged with 18 criminal counts of conspiring to hack government computers and with violating an espionage law, all in connection with his work with the site.

In 2010 Wikileaks, along with The New York Times and The Guardian, published classified U.S. military documents and field reports from the Iraq and Afghanistan war, which supporters say shed light on previously undisclosed aspects of the wars, including civilian death counts.

RELATED More than 100 physicians warn Julian Assange could die in prison

Two years later Assange, who is originally from Australia, took refuge in Ecuadorian Embassy in London to avoid extradition to Sweden, where he was accused of sexual assault.

The Swedish government announced in November that it was discontinuing that investigation.

Assange was removed from the Ecuadorian Embassy in April and has been in prison since the United States requested extradition.

Earlier this week 100 physicians signed an open letter saying Assange was suffering from "psychological torture and medical neglect" in prison.

His hearing at Woolwich Crown Court is expected to begin Monday.

The court cannot evaluate whether Assange is innocent of the charges themselves, but can decide whether they are politically motivated, as his attorneys are expected to argue.

"This is not about left or right, we can unite on this, it is a dark force against [those] who want justice, transparency and truth," Kristinn Hrafnsson, editor in chief of WikiLeaks, said at Saturday's protest.

Assange could face a 170-year prison sentence if extradited to the United States and convicted.