In political science, the special law of curvilinear disparity or May's Law is a theory conceived in 1973 by political scientist John D. May in his publication Opinion Structure of Political Parties.[1] The theory posits that the rank and file members of a political party tend to be more ideologically extreme than both the leadership of that party and its voters.[2] May contends that politically active people can be classified into three major strata or echelons according to their relative status within a party; party elite, middle-elite, and non-elite. Members of each divergent strata have contrasting motivations for being politically active and calibrate their ideological stances to differing extents as a result.[3]