Explanation:

- Legislature: A legislative body of a country or state responsible for making laws. Doesn't fit the definition given.

- Bureau of Justice Statistics: A U.S. agency collecting and disseminating crime data. It's not defined as a group with common objectives in the same sense.

- Unconstitutional: Describes actions or laws that contradict the constitution. Not related to interrelated parts working together.

- System: A set of interrelated components working as a whole towards a common objective, matching the description provided.