Why is US scared of Julian Assange?

Who Is Julian Assange?
Julian Assange is an Australian, Computer programmer, Journalist , activist. He has become a hero for the advocates of free and informed society.

Born on July 3, 1971, in Townsville, Australia, Julian Assange in 2006, founded WikiLeaks, a website, to collect and share confidential information on an international scale. The underlying principle was to inform the “public” about “the powers” which rule them. Time magazine awarded him “Person of the Year” title in 2010.

What are his contribution to make an informed world?

2007 – WikiLeaks posts the procedures manual for Camp Delta, the US detention center in Guantanamo Bay.
September 2008 – WikiLeaks posts emails from vice presidential candidate Sarah Palin’s Yahoo account.
April 5, 2010 – WikiLeaks posts a video showing a US military helicopter firing on and killing two journalists and several Iraqi civilians in 2007. The military claims that the helicopter crew believed the targets were armed insurgents, not civilians.
July 25, 2010 – WikiLeaks posts more than 90,000 classified documents related to the Afghanistan war.
October 22, 2010 – WikiLeaks publishes classified military documents from the Iraq war.
November 28, 2010 – WikiLeaks begins publishing diplomatic cables from US embassies. The site says the documents will be released in stages “over the next few months.”

April 24, 2011 – WikiLeaks begins releasing classified military documents providing details on the behavior and treatment of detainees being held at the US Navy’s detention facility at Guantanamo Bay.

September 2, 2011 – WikiLeaks releases its archive of more than a quarter million US diplomatic cables.
July 22, 2016 – WikiLeaks releases nearly 20,000 emails from Democratic National Committee staffers. The leaked emails appear to show the committee favoring presumptive Democratic nominee Hillary Clinton over Bernie Sanders during the US presidential primary. On July 29, Assange tells CNN’s Anderson Cooper that the email release was timed to coincide with the start of the Democratic National Convention.
What are the charges on him?
There are no declared or standing charges on him in any country except on minor charge from England. Britain ruled that Assange would be arrested as soon as he comes out of Ecuador Embassy in London because he is facing the charges of voilating the bail terms. He was charged for this when he did not appear in Swedish court for the hearing in sexual assult charges levied on him by two swedish women. He said that he had never seen them. Later, the Swedish court dropped the charges. But the British court his holding the bail terms voilation charges against him.
But lately it has been inadvertently revealed by prosecutors in Virginia District Court that he has been charged in certain cases. There is no clarity regarding the charges as yet.