People hold a banner while attending a vigil for the victims of a shooting by a far-right extremist that left several people dead in Hanau, near Frankfurt, Germany. REUTERS/Christian Mang
People hold a banner while attending a vigil for the victims of a shooting by a far-right extremist that left several people dead in Hanau, near Frankfurt, Germany. REUTERS/Christian Mang

Music festivals make millions in revenue for far-right extremists