The sweetly screaming figure with the word SLUT written prominently on her midriff has just grabbed an audience by the ears. As the last clash of cymbals falls, she tells the girls to come to the front to get away from the violently moshing boys. She then launches into the next hook-blooming, distortion happy song with a look of tortured bliss on her face. This is Kathleen Hanna, the songwriter and singer for Bikini Kill. She’s the one making all the noise. She’s also the subject of the new documentary The Punk Singer, which sees director Sini Anderson exploring the art, fame and activism of a proud feminist icon who had bigger balls than many of her male counterparts.