Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears on the screen or printed page of such transmission. JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. American Sociological Association is collaborating with JSTOR to digitize, preserve and extend access to American Sociological Review. http://www.jstor.org * Revision of a paper read at the 1966 Annual Meeting of the American Sociological Association. This paper was prepared during the course of research on industrial corporations supported by Grant No. GS-742, National Science Foundation. Numerous colleagues criticized an earlier version unstintingly, but I would like to single out Ernest Vargas, Geoffrey Guest and Anthony Kovner, who transcended their graduate student roles at the University of Pittsburgh during the formulation of these ideas in sticky field situations.

Drawing on the perspective developed in recent work by Oberschall (1973), Tilly (1975) and Gamson (1975), we analyze the political process centered around farm worker insurgencies. Comparing the experience of two challenges, we argue that the factors favored in the classical social movement literature fail to account for either the rise or outcome of insurgency. Instead, the important variables pertain to social resources-in our case, sponsorship by established organizations. Farm workers themselves are powerless; as an excluded group, their demands tend to be systematically ignored. But powerlessness may be overridden if the national political elite is neutralized and members of the polity contribute resources and attack insurgent targets. To test the argument, entries in the New York Times Annual Index are content coded and statistically analyzed, demonstrating how the political environment surrounding insurgent efforts alternatively contains them or makes them successful.

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