A man accused of sending threatening letters to a raft of public figures went on trial in the German financial hub Frankfurt on Wednesday. The letters contained racist insults and death threats, and were often signed “NSU 2.0,” a reference to the National Socialist Underground, a far-right terrorist group that was uncovered over a decade ago. The trial began with a reading of the long indictment against 54-year-old defendant, identified as Alexander Horst M. The prosecution accuses him of 67 counts of insulting behaviour, attempted coercion and threatening behaviour, public incitement, possess…