Abstract
This article asks why new protest movements have recently emerged in Western Europe by focusing on the British postwar race and anti-nuclear movements. Contrary to “subjective” propositions which have attributed their emergence to inter-generational value change, this article instead proposes a “structural” explanation. It is argued that the failure of the major British political parties to articulate citizen concerns on a number of salient issues has generated extra-party initiatives whose willingness to “voice” citizen anxieties primarily explains their popular support. Once in existence, these groups further politicize the conflict over public policy through various unconventional activities.