The national association of realtors hires a consulting group to meet with members of congress and the senate and develop, advance, and influence legislation concerning the ownership and operation of real estate. this is an example of

This is an example of lobbying, in which an organization made up of a specific group forms to influence government policy on behalf of the interests of that group.

Typically, the interests being advocated are financial, and the group is made of of people who work in a certain industry. In this case, the interest group is the national association of realtors, and they are lobbying for the interests of people in the real estate industry.