A canoe and recreation club recently filed suit against a number of manufacturing plants located along the Missouri River.

A canoe and recreation club recently filed suit against a number of manufacturing plants located along the Missouri River. In the suit, the club claimed that the plants failed to adequately treat the waste that is being dumped into the streams and waterways, thus adversely affecting the recreational opportunities available to club members. The canoe and recreation club is an example of a(n) _____ of the manufacturing companies that operate these plants.