Pressure groups, also known as interest groups, advocacy groups, or lobby groups, are diverse organizations that use various tactics to influence public policies and decision-making processes. They can be classified according to their goals, membership, strategies, or sectors of activity. For example, environmental groups, consumer groups, trade unions, or civil rights groups are some types of pressure groups that exist worldwide. These groups can also be local, national, or international in scope, and they can collaborate or compete with each other. Some synonyms for pressure group are political action committee, campaign group, social movement, interest bloc, or cause-oriented organization. These labels reflect the different perspectives that analysts and activists have on these influential actors in democratic societies.