A college professor has several interacting roles--as scholar, specialized technician, employed professional, and citizen. It is to the subject of the professor as citizen, or more precisely, as politico-social activist, that this paper is directed. Proceeding as a taxonomist, the author offers a tentative empirical classification of the positions taken or arguments advanced by professors in the 2 camps, activist and passavist. The class of "effectively uninvolved professors" is a large one containing many species whose distinctive behaviors and ideologies are evident even though the class shares a general trait of feeble or no participation in the social process. These types are: the nihilist, dropout, retreatist or delinquent, the eclectic, pluralist or dually committed, the diphasic, obsessive, partially committed, the laissez-faire conservative, the professor paralyzed by fear, the believer that activism is uncouth, unscholarly or unprofessional. The activist professors include: reactionaries, issues protesters, and revolutionaires, of which these are 2 varieties depending upon their acceptance or rejection of the pacifist ethic. "...pacifism may be the most telling single criterion of humane citizenship, today and tomorrow." The professor who doesn't cop out knows that as an ethical being he must accept the obligations of citizenship. (JS)