JWs will deny that local needs parts are often just a way to mark those in the congregation who are deemed to be "bad association" or who don't fall in line with the Elders viewpoints. Now, for the first time in a long time the WT discusses their marking policy and how it works in the Nov study WT:
Recall Paul’s counsel regarding disorderly ones in the congregation. Some individuals were ‘not working at all but were meddling with what did not concern them.’ They were evidently admonished by the elders but persisted in disregarding the counsel. How was the congregation to deal with such a person? Paul directed: “Keep this one marked and stop associating with him.” That counsel was balanced with the caution not to treat such a person as an enemy. (2 Thess. 3:11-15) Today, elders may give a warning talk about someone’s persisting in a course that reflects badly on the congregation, such as dating an unbeliever. (1 Cor. 7:39) How do you react when the elders find it necessary to give such a talk? If you are aware of the situation described in the talk, will you take care to avoid socializing with such an individual? Your loving concern and firm stand may move the person to abandon a disorderly course.