Informal political groups, such as grassroots organizations or advocacy networks, can significantly affect mainstream politics by mobilizing grassroots support and influencing public discourse. These groups often lobby for specific policies or causes, raising awareness and generating public interest that can pressure formal political entities to act. They can also serve as a check on political power by holding elected officials accountable, thereby enhancing democratic practices. Furthermore, informal groups can engage younger voters and disenfranchised populations, bringing new voices into the political conversation.