What direct strategy commonly used by interest groups involves lawsuits legal fees and amicus curiae briefs?

The direct strategy commonly used by interest groups that involves lawsuits, legal fees, and amicus curiae briefs is known as litigation. This approach allows interest groups to challenge laws or regulations in court, using legal action to promote their agenda. By filing lawsuits or submitting amicus curiae briefs, which provide additional perspectives to the court, these groups seek to influence judicial outcomes in their favor. This strategy is particularly effective in shaping public policy and advancing specific issues through the legal system.