"An official organization whose job is to manage a particular activity, suggest laws related to the activity, and make certain that laws are obeyed" concerning law enforcement. (CD)
The graph displays the other subjects mentioned on the same pages as the subject "Boards of Police". If the same subject occurs on a page with "Boards of Police" more than once, it appears closer to "Boards of Police" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.