A few months later he was summoned to the mayor 's office in Laubach where he was warned by the mayor and the local Nazi Party leader that he and his wife would be sent to a concentration camp if he continued to be a `` bad influence '' on the population of Laubach .
Kellner was told he and his wife would be sent to a concentration camp if he continued to be a `` bad influence '' on the people of Laubach .