Crass was a British anarcho-punk band formed in 1977 that became pioneers of the punk movement, known for their provocative lyrics, DIY ethos, and uncompromising political activism. The band rejected commercialism and the music industry establishment, famously refusing to appear on Top of the Pops and instead releasing their music independently through their own Crass Records label. With albums like "The Feeding of the Five Thousand" and "Penis Envy," they challenged social norms and inspired generations of punk and alternative artists before disbanding in 1984.