The authors of this literature review find that empirical research on unions' political activity since World War II has failed to answer many important questions. Not only have researchers neglected some issues outright, but disparate data sources and statistical methods, lack of a guiding theory, inconsistent findings, and hidden normative assumptions about the propriety of unions' political involvement limit the generalizability of reported results. The review nevertheless confirms that union members and leaders often differ in political orientation, though the extent of disagreement varies across political issues. Also, unions apparently have been more successful at achieving political objectives only weakly supported by their members than at achieving the objectives their members strongly support. BECAUSE of the decline in union membership, a more hostile organizing environment, and other external factors, unions have increased their national political activities in recent years. The number of professional lobbyists retained by unions has increased significantly since 1978, and union political action committee (PAC) contributions to federal candidates have increased from $6.3 million in 1974 to $26.3 million in 1984 (Masters and Delaney 1985). Also of significance, the AFL-CIO endorsed for insightful comments on an earlier draft of this paper.
endorsement. These developments illustrate the increased importance many union leaders attach to the election of sympathetic lawmakers and the achievement of favorable legislative objectives.The payoffs for political action, however, have always been uncertain. Both the Taft-Hartley and Landrum-Griffin amendments to the National Labor Relations Act were passed despite vehement union opposition, and several recent legislative proposals favored by unions, such as the Labor Law Reform Act of 1978, have not been enacted. It has even been suggested that "unions have been unable to win the legislation most important to them as institutions" (Freeman and Medoff 1984:192). Further, though labor's political success has fluctuated over time, it has declined in several respects since the election of Ronald Reagan-who, ironically, was