How Brussels took on Orban's son-in-law

By June 2015, the scandals that had shaken Hungary’s governing party a few months earlier had mostly faded away. Behind the scenes, though, another story began to emerge that might cause long-term problems for the party’s highest circles.

It was becoming clear then that the European Union is seriously interested in the controversial businesses of Istvan Tiborcz, the son-in-law of Viktor Orban, Hungary’s prime minister.

In the first weeks of the summer, investigators of Olaf, the E...