Blood Must Flow – Undercover Among Nazis is a German documentary that follows a journalist who infiltrates neo-Nazi rock gigs with a hidden camera.
In the former East German town of Mucka, in Saxony, a local politician from the extreme-right National Democratic Party is seen hobnobbing with party-goers. Later the club owner apologizes to disappointed skinheads that because of complaints about illegal music, they will have to switch to a benign form of entertainment. The next scene shows a conga line of neo-Nazis dancing to German folk-pop music. [source]