In the dynamics of an iron triangle,what benefit do interest groups provide to friendly bureaucratic agencies?

Question

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Interest groups provide lobbying support for agency programs, which can help the agency achieve its goals and objectives. Interest groups can also provide information and expertise on issues related to the agency's programs, as well as mobilize public support for them. This can be beneficial in gaining political and financial support from elected officials and other stakeholders.

In the Dynamics of an Iron Triangle,what Benefit Do Interest