We know the secret police's methods, and the way the archive and registry were run - that's how we know. We've also found evidence from the Bolek file cited in other files.

We're historians and above all want to write about what was. Our book doesn't deal with legacies. It also wasn't our goal to destroy a legend. We consider Walesa to be a national symbol. He led Solidarity and remains an icon. But he also worked with the secret police under the name Bolek. The truth isn't always simply black and white.

Walesa was a national hero, a true icon. The vast majority of Poles didn't believe a word the authorities said. They took everything the official media said about Walesa to be a manipulation by the Communist authorities.