Huddled at a home in Ecuador's capital, President Lenin Moreno's aides anxiously awaited word in the middle of the night on an operation that would soon make headlines around the world: the arrest of WikiLeaks founder Julian Assange inside the country's London embassy.

Over the course of nearly seven years, the Australian hacker had all but worn out his welcome at the embassy with antics that included late-night skateboarding, harassing the staff and smearing his feces on the walls, according to Ecuadorian officials.

Moreno had finally decided to kick Assange out after getting wind of a WikiLe...