It looks like the US is charging him with conspiracy to hack a government computer.
https://www.google.com/amp/s/www.nytimes.com/2019/04/11/worl...
https://www.google.com/amp/s/www.nytimes.com/2019/04/11/worl...
People like Assange are fortunate to have visibility and nationality that they do. He at least is getting charged for a crime he hasn't really even denied. Thousands of others have lost their freedom and their lives because they were at the wrong place at the wrong time.