Activists in a large city join forces to create a new organization with the goal of preserving landmark buildings that have historical importance. at first, the organization functions democratically, but over time it is taken over by three people. these leaders establish a bureaucratic structure that them to maintain control of the organization. these developments can be best explained by:

The iron law of oligarchy

Explanation:

The iron law of oligarchy is a law of all organization including those are committed to democratic ideals and practices will succumb elite the rules with oligarchy. It has been contended that organizational democracy is an oxymoron. Even the elite control makes internal democracy very unsustainable. It is also called shape the long term development of all organizations. It is a central law of an organization in labor, political parties, etc.  

if interdependence implies a two-way dependence, and if each partner is equally dependent on the other for success, then there is an equal commitment to the making the partnership successful. the advantage is sustainability of the relationship, the disadvantage is that decisions are "democratic" and therefore may take longer to reach and more likely to be a compromise (which is not always the best solution). as the interdependence moves away from equality, the decisions become more influenced by the more independent partner. in the extreme the relationship becomes more dictatorial and more like "master-slave". generally the relationship has less commitment in both directions and is more likely to be temporary.

if one generalizes (and one shouldn't), equity partnerships, which is probably what is implied by interdependence, can be slow to progress or change but durable. the extreme alternative, independent-dependent partnerships tend to be efficient but more fragile.

hope this but you will have to site your own evidence. : )