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With one partial exception, political scientists have carried out little empirical research on corporate political activity. That one exception is political action committees, PACs. Perhaps because of the ready availability of apparently reliable data on corporate political contributions, most empirical studies of business political activity have concentrated on PACs. The study of PACs is not, however, synonymous with the study of corporate political behaviour. Indeed, not all corporations have PACs; Sabato estimated that almost half the largest manufacturing corporations did not. At least one politically active corporation, Du Pont, refused for many years to establish a PAC.