Thursday, July 23, 2015


Illustration from Harper's Weekly December 13, 1913 by Walter J. Enright
Interlocking Directorates in the Corporate Community

by G. William Domhoff

Interlocking directorates -- defined as the linkages among corporations created by individuals who sit on two or more corporate boards -- have been a source of research attention since the Progressive Era at the turn of the 20th century, when they were used by famous muckraking journalists, and future Supreme Court Justice Louis Brandeis, to claim that a few large commercial and investment banks controlled most major corporations.

Today corporate interlocks are analyzed with bigger databases and sophisticated network programs, thanks to desktop computers. The databases are large matrices that contain information on the linkages between persons and groups. Either a corporate/organizational network, based on common directors, or an interpersonal/social network, based on shared board memberships, can be derived from these matrices. That is, the matrices contain a "duality of persons and groups" (Breiger, 1974). This is worth mentioning because this essay will discuss both "corporate networks," that is, the linkages among corporations created by interlocking directorates, and "social networks," that is, the linkages among people by virtue of the fact that they sit on the same corporate board.

The conclusions from the more recent studies are very different from those drawn 100 years ago, probably because the interlocks now mean something different than they did back then. Interlocks used to have the strategic purpose of tying corporations together for economic advantage for the owners. Today they are more the incidental by-product of recruiting a diverse and experienced group of individuals who have a variety of skills and connections to bring to the table.

It's also important to note that most corporate directors are not interlocking directors. Even when a large number of companies are included in the database, making the possibilities for interlocks much greater, only about 15-20% of corporate directors sit on two or more corporate boards. And even fewer, of course, sit on three, four, five, or six boards, although they are the people who tie the network together. They are "linchpins," as one research team puts it (Davis, Yoo, & Baker, 2002).


Interlocking directorate

Interlocking directorate refers to the practice of members of a corporate board of directors serving on the boards of multiple corporations. A person that sits on multiple boards is known as a multiple director.[1] Two firms have a direct interlock if a director or executive of one firm is also a director of the other, and an indirect interlock if a director of each sits on the board of a third firm.[2] This practice, although widespread and lawful, raises questions about the quality and independence of board decisions.

Network diagram showing interlocks of the board members of American International Group (AIG), from 2004 with other U.S. corporations.
Socio-political importance

According to some observers (John Asimakopoulos), interlocks allow for cohesion, coordinated action, and unified political-economic power of corporate executives. They allow corporations to increase their influence by exerting power as a group, and to work together towards common goals. They help corporate executives maintain an advantage, and gain more power over workers and consumers, by reducing intra-class competition and increasing cooperation. In the words of Scott R. Bowman, interlocks "facilitate a community of interest among the elite of the corporate world that supplants the competitive and socially divisive ethos of an earlier stage of capitalism with an ethic of cooperation and a sense of shared values and goals."

Interlocks act as communication channels, enabling information to be shared between boards via multiple directors who have access to inside information for multiple companies. The system of interlocks forms what Michael Useem calls a "transcorporate network, overarching all sectors of business." Interlocks have benefits over trusts, cartels, and other monopolistic/oligopolistic forms of organization, due to their greater fluidity, and lower visibility (making them less open to public scrutiny). They also benefit the involved companies, due to reduced competition, increased information availability for directors, and increased prestige.

Some theorists believe that because multiple directors often have interests in firms in different industries, they are more likely to think in terms of general corporate class interests, rather than simply the narrow interests of individual corporations. Also, these individuals tend to come from wealthy backgrounds, socialize with the upper classes, and tend to have worked their way up the corporate hierarchy, making it more likely that they have internalized values that will cause them to personally support policies that are beneficial to business in general.

Furthermore, multiple directors tend to be more frequently appointed to government positions, and sit on more non-profit/foundation boards than other directors. Thus, these individuals (known as the "inner circle" of the corporate class) tend to contribute disproportionately to the policy-planning and government groups that represent the interests of the corporate class, and are the ones that are most likely to deal with general policy issues and handle political problems for the business class as a whole. These individuals and the people around them are often considered to be the "ruling class" in modern politics. However, they do not wield absolute power, and they are not monolithic, often differing on which policies will best serve the interests of the upper classes.

Interlocks not only occur between corporations, but also between corporations and non-profit institutions such as foundations, think tanks, policy-planning groups, and universities. They can also be seen as a subset of connections in a larger upper class social network which includes all of the aforementioned types of institutions as well as elite social clubs, schools, resorts, and gatherings. Multiple directors are "roughly twice as likely as single directors to be in the Social Register, to have attended a prestigious private school, or to belong to an elite social club."
Network diagram showing interlocks between various U.S. corporations and institutions and the Council on Foreign Relations, in 2004
Modern interlock networks

Analyses of corporate interlocks have found a high degree of interconnectedness amongst large corporations. It has also been shown that inbound interlocks (i.e. a network link from external firms into a focal firm) have a much greater impact and importance than outbound interlocks, a finding that laid the foundation for further research on inter-organizational networks based on overlapping memberships and other linkages such as joint ventures and patent backward and forward citations. Virtually all large U.S. corporations are linked together in a network of interlocks. Most corporations are within 3 or 4 "steps" from each other within this network. Approximately 15-20% of all directors sit on two or more boards. The largest corporations tend to have the most interlocks, and also tend to have interlocks with each other, placing them at the center of the network. Major banks, in particular, tend to be at the center of the network and have large numbers of interlocks. With the globalization of financial capital following World War II, multinational interlocks have become progressively more common. As the Cold War escalated, well-connected members of the CIA harnessed these interconnections to launder money through front foundations, as well as more substantial institutions such as the Ford Foundation. A relatively small number of individuals—a few dozen—bind this multinational network together by participating in transnational interlocks and sitting on the boards of multiple global policy groups (such as the Council on Foreign Relations).


In the United States, the Clayton Act prohibits interlocking directorates by U.S. companies competing in the same industry, if those corporations would violate antitrust laws if combined into a single corporation. However, at least 1 in 8 of the interlocks in the United States are between corporations that are supposedly competitors.

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