Konstantin Pogorely is a genealogist and proprietor of Genealogia.ru. (If text on the site looks like gibberish, it's probably because you don't read Russian—try here.) Over the years, he's learned that discretion is the better part of genealogical valor. Ancestors believed by clients to have been Stalin-era political prisoners have proved to be petty criminals. And at least one war hero proved even worse.
Pogorely said he always tried to prepare clients for the unexpected. In one case, he decided not to tell an elderly woman that her father had earned his medals in World War I not on the battlefield, but as the commander of a firing squad. Pogorely shared his findings with the woman's daughter, who thanked him for his discretion. [Link]