A pressure group opposes and pressurizes to correct the misconducts carried out by government and government bodies against the interest of the people. In other words, pressure group is a group of people who are associated together based on similar interests. They are organized to promote their interests. People may be organized in small or large groups. Some pressure groups work for the interests of the people and some are critical of government works. Here we are discussing about the pressure groups which work for the welfare of the country and people.
A pressure group plays a vital role in strengthening democratic system of a country. In the countries where democracy is successfully practiced, the pressure groups are found to be working effectively and creatively. It should be understood that pressure groups are necessary for successful practice of democracy. Pressure groups are formed according to the level of awareness of people in the countries. The more advanced the society, the more pressure groups are found. Their roles and responsibilities increase. The positive aspect of democracy is the formation of selfless and creative pressure groups.
Professional, economic, political, social, cultural, religious, linguistic, racial and democratic groups are directly or indirectly active in a society. These groups have specific but different interests and objectives. They pressurize government or government bodies in accordance with the political environment. Those communities are also known as pressure groups. Here our focus is on such types of pressure groups which are mobilized for the establishment of a political system and for supports control of corruption.
Those pressure groups, which have positive and creative policies and function accordingly, can enhance ideal democracy.
Pressure groups can be categorized into following types:-
1.  Constructive
2.  Destructive

1.  Constructive:
For development of constructive pressure groups, the conscious people in society come up voluntarily to form a group. When formed, this group makes a clear action plan including its policies, objectives and activities. That action plan can be implemented duly. Only after this, constructive pressure group is found useful for people and nation.
2.  Destructive:
Destructive pressure groups are instigated to revolt in developing countries. They are sponsored and guided by somebody else. Where there is financial gain, such groups are organized. In other words, these types of pressure groups are used by political parties to achieve their objectives. Such groups are mobilized internally or/and externally. These pressure groups harm both people and the country.
Among two pressure groups explained above, only the constructive pressure group is necessary for us. The constructive pressure groups are also divided into three categories:-
a.  Consumer group,
b.  Interest group,
c.  Political group.
a.  Consumer group:
Consumer group works for two sectors:
i.  Supply of necessary goods,
ii. Preparation of development and infrastructure.
b.  Interest group:
Interest group concerns with:
i.    Child welfare,
ii.   Service to elders,
iii.  Women welfare,
iv.  Welfare of disabled,
v.   Protection of race, culture and religion,
vi.  Protection of species etc.
c.  Political group:
Political group’s main roles are:
i.   Promotion of political principles and their awareness,
ii.  Creation of environment to adopt political principles.
The classification of pressure groups stated above is given in following chart.

From the above chart, we can see the areas of three types of pressure groups. We can study their areas comparatively. In this way, democratic system can be sustained by creating pressure groups.
The pressure groups pressurize the decision at policy and makers action level. They control the authority with their pressure.
How the pressure groups control the concerned agencies from autocratic is clarified in the following chart.

The functional method and procedure of a pressure group should be based on the existing law and regulations of the country. The pressure groups should determine their working area and criteria according to the government policy and strategy. A single pressure group can make its criteria/methodology according to change in time and situation of a country. The pressure groups should be extremely alert. Positive and constructive pressure groups are interesting and people want to form and promote them. If such types of pressure groups are formed, the democratic welfare state can be retained.
But if they are subjected to ill political influence, the pressure groups get weak. If there is penetration of foreign interest in pressure groups, their effect the people and country will be negative and harmful. Therefore, formation of such groups, their policies, action plans and activities must be scrutinised, monitored, guided and controlled by the specific law of the country. They should work positively for the people and country. The law to operate the pressure groups should be specifically made. Such type of legal provision is as important as the awareness of the people. The country should create the environment to develop such smart pressure groups. After that, there comes the condition of zero tolerance to corruption.