In 2007 , the Canadian film company , CCI Entertainment of Toronto , made a documentary film about both Friedrich Kellner and his grandson Robert Scott Kellner . The film is called , My Opposition : the Diaries of Friedrich Kellner . In 2007 CCI Entertainment , a Canadian film company , produced a documentary film entitled My Opposition : The Diaries of Friedrich Kellner , which interweaves the stories of Kellner and his American grandson .