Final answer:
Interest groups are characterized by leadership and staff organization, methods for overcoming collective action problems, and strategies for influencing public policy.
Step-by-step explanation:
The three organizational features shared by interest groups are leadership, a method for collective action, and strategies for influencing public policy. First, effective interest groups have leaders and a dedicated staff that control the group's objectives and manage its resources. These leaders and staff members are also responsible for recruiting and representing the group's membership. Second, they must employ methods to overcome collective action problems. This often includes providing incentives to join or participate actively, as many individuals may not contribute if they believe their single effort won't impact the group's success. Third, interest groups implement strategies to affect public policy, such as lobbying or indirect lobbying, forming relationships with decision-makers, and participating in the policy-making process. These features are crucial for the functionality and success of any interest group, as seen in organizations like the NRA, which advocates for gun rights, and Brady: United Against Gun Violence, which pushes for more stringent gun controls.