In many respects the period 1976 to 1981 can best be seen as a transitional period from the IS to the SWP. Not only was the rank and file strategy abandoned in practice, if not in theory, but there was in this period a massive change in leading figures within the group. By the end of this transition not only had figures associated with the ISO left but so to had a layer of intellectuals such as Steven Marks, Richard Kuper, Martin Shaw and Peter Sedgwick; industrial organisers such as Steve Jeffreys, Arthur Affleck and Bill Message had also left; in addition to which almost the entire toe-hold in blue collar industry won so laboriously had left or been expelled. And all this before the large scale restructuring of British capitalism.