British post-punk entered the 1980s with support from members of the critical community—American critic Greil Marcus characterised "Britain's postpunk pop avant-garde" in a 1980 Rolling Stone article as "sparked by a tension, humour and sense of paradox plainly unique in present day pop music"—as well as media figures such as BBC DJ John Peel, while several groups, such as PiL and Joy Division, achieved some success in the popular charts. Which groups didn't find success?