Final answer:
An interest group utilizing the population for lobbying is engaging in grassroots lobbying, a strategy where public pressure is used to influence government decisions.
Step-by-step explanation:
If an interest group is using the population to assist in lobbying, then that group would be engaging in what's known as grassroots lobbying. Grassroots lobbying is a form of indirect lobbying where interest groups reach out beyond the usual political and government channels and try to mobilize the general public to support their cause. This can take many forms, such as prompting individuals to contact their political representatives, organizing rallies, or creating media campaigns that encourage public action.
Organizations may use inside lobbying strategies which involve direct interactions with government officials to influence policy decisions. This contrasts with grassroots lobbying, which is more about encouraging ordinary citizens to exert pressure on their representatives.
Interest groups can be incredibly diverse, representing a wide array of concerns – from business, environment, civil rights, to education. By involving the population in getting its message out, an interest group like the Sierra Club may issue a press release about environmental legislation or mobilize its members through calls to action to campaign for specific policy changes. Such collective constituent advocacy gets the attention of lawmakers because it represents the voice and concerns of the voters they represent.