Answer:
Actually, there are three major types of interest groups. Animal rights groups such as People for the Ethical Treatment of Animals(PETA) and environmental interest groups such as GREENPEACE usually organize as PUBLIC-INTEREST GROUPS. These groups claim to work not for self interest but for the best interest of the public.
Underpaid professional workers may organize as groups. Lawyers belong to the AMERICAN BAR ASSOCIATION, doctors belong to the AMERICAN MEDICAL ASSOCIATION, and teachers belong to the NATIONAL EDUCATION ASSOCIATION or the AMERICAN FEDERATION OF TEACHERS. Labor unions such as the AFL-CIO and the TEAMSTERS' UNION to protect workers in factories or businesses.
The most common type of interest group is formed around businesses, corporations, and trade associations. Part of their reputation for power is based on the fact that they represent about half of all interest groups in Washington. People who criticize interest groups for having undue power in government believe that the business groups get special privileges for people who already have more wealth and power than ordinary citizens. For example, the oil and tobacco industries each have interest groups who promote their respective interests on CAPITOL HILL.
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