The concept of the iron triangle in U.S. politics refers to the stable and cooperative relationship between government agencies, Congressional committees, and interest groups. This triad works together to create and implement policies that benefit specific interests, often at the expense of broader public concerns. For instance, a congressional committee may provide funding to a government agency, which in turn develops regulations favorable to an interest group. This arrangement can lead to the entrenchment of certain policies and practices, limiting accountability and creating barriers for reform.