interest groups
Does "interest groups" imply "groups somehow related to it" and not "people having benefits there"? Because, families of dead people can not have benefits in a memorial.

Context:
War memorials provoke debate. Libeskind’s 2003 plan for the memorial to 9/11 is yet to go up, as interest groups, including the bereaved, battle for their vision of its meaning.

Question

interest groups
Does "interest groups" imply "groups somehow related to it" and not "people having benefits there"? Because, families of dead people can not have benefits in a memorial.

Context:
War memorials provoke debate. Libeskind’s 2003 plan for the memorial to 9/11 is yet to go up, as interest groups, including the bereaved, battle for their vision of its meaning.

Answer

An interest group means a group of people who  share  a common interest or have a common objective or point of  view in relation to something. In the case of a memorial, the families of those who died are a significant interest group as it affects them personally and they doubtless have strong views on the subject.