Special interest and vested interest groups continuously oppose one another. Special interest groups tend to be initiators or action, while vested interest groups are more often found as opponents of social change. Vested interest groups do, however, support proposed change when they perceive it as beneficial to them. The main function of the PAC is to ensure the election and reelection of candidates who are already known to favor the PAC's goals. This is cheaper than having to buy the candidate again as each issue arises.
Great power tends to produce opposing power.
Big Business Business operates today under a great many rules and regulations. Business interests fervently desire the kinds of regulation which benefit them. Other regulations are imposed upon businesses through the pressure of other interest groups, presumably to protect the public interest. The battle is not over whether there will be controls and regulations, but in whose interest they will operate. Before the 1930s, few workers were unionized.