INTRODUCTION

How should a democracy react to the presence of anti-democratic actors in its midst? Debate over this question could hardly involve a broader set of issues. Looking to history, the twentieth century provides examples of totalitarian parties attaining power through democratic elections, and thereafter dismantling their countries' democratic institutions. Yet there are also societies in which toleration of anti-democratic actors appears to have diminished their popular appeal. Turning to political theory, some scholars conceive of democracy as an essentially procedural idea, one in which open debate and electoral competition among all ideological factions serves as the touchstone of democratic legitimacy. Others posit a substantive conception of democracy holding, in Rawls's terminology, that democratic societies need not tolerate the intolerant. And in the discipline of comparative politics, scholars debate whether democracy in some societies is so fragile that it cannot withstand vigorous popular appeals by its committed opponents.