Final answer:
Interest groups use amicus curiae briefs to influence court decisions and advance their policy preferences, with the NAACP's involvement in Brown vs. The Board of Education being a notable example.
Step-by-step explanation:
Interest groups often join in court cases through the use of amicus curiae briefs in order to advance their policy preferences through the court system.
These groups, neither plaintiffs nor defendants, will be affected by the case's outcome and thus submit these legal documents to inform the judge about their position and how the decision may impact them.
Alongside direct and indirect lobbying, electioneering, and shaping public opinion through the media, litigation is a crucial tool for interest groups aiming to affect public policy. For example, the NAACP's involvement in the landmark Brown vs. The Board of Education case profoundly influenced the course of civil rights in the United States.