Strike action is mostly used by

Strike action is mostly used by pressure groups.

Pressure groups are organizations formed to influence public policy and decision-making. These groups often bring attention to social, economic, or political issues by advocating for changes through various forms of protest, including strike actions. Their key purpose is to create awareness and apply pressure on decision-makers, such as governments or corporations, to address their concerns.

For example, labor unions, which are a type of pressure group, commonly employ strikes as a means to demand better wages, improved working conditions, or labor rights from employers. By organizing a strike, these groups can effectively draw public attention to their cause, disrupt normal operations, and compel the concerned parties to negotiate or take action.

In contrast, political parties focus primarily on winning elections, traders are usually individual business people whose primary interest is commerce, and parliamentarians are lawmakers engaged in legislative duties. While these groups might support or oppose strike actions, they typically do not organize them. Therefore, the organizing and execution of strikes are most closely associated with pressure groups.