The director of the memorial at two former Nazi concentration camps says he has been receiving threats after sending a letter to voters ahead of state elections next month in which he sounds the alarm over the far-right Alternative for Germany (AfD). Jens-Christian Wagner, who heads the memorial at the Buchenwald and Mittlebau-Dora concentration camps in the eastern state of Thuringia, sent a letter to 300,000 voters over 65 ahead of regional elections scheduled for September 1. The letter was sent to seniors, he said, because such people are less likely to get their information from social me…