What three kinds of groups make up an iron triangle?

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pohnpei397 eNotes educator| Certified Educator

The three groups that make up iron triangles are the government agencies (bureaucracies) that are supposed to regulate a given area of the economy or a given group, the congressional committees that oversee the government agencies, and the interest groups that represent the people who are regulated by the agencies.  For example, let us imagine an iron triangle having to do with agriculture.  It would be made up of the US Department of Agriculture, the Agriculture committees of the House and Senate, and interest groups representing farmers, farm equipment manufacturers, and others who are part of the agriculture business.