‘We need to deport, deport, deport!’ Björn Höcke, leader of the Alternative für Deutschland in Thuringia, emphasises each word with a clenched fist. It’s a hot Saturday evening in the small town of Arnstadt and Höcke is launching the AfD’s state election campaign. His branch of the party has been categorised as ‘indisputably far right’ not just by the press but by German domestic intelligence.