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Working environment of construction workers is very weak. They work for a living in 3D conditions; dangerous, dirty and difficult. They are most daily laborers, their employment is unstable. These problems make worse the demand and supply system of workers in the construction industry. The one measure to solve such problems is to activate the union actions. According to a new World Bank study on the effects of unions and collective bargaining in the global economy, workers who belong to unions earn higher wages, work fewer hours, receive more training, and have longer period of employment on average, than their non-unionized colleague. At the macroeconomic level, high unionization rates lead to lower inequality of earnings and can improve economic performance(in the form of lower unemployment and inflation, higher productivity and speedier adjustment to shock). This study aims to strengthen the solidarity of the Regular Worker's Construction Labor Union and the Daily Worker's Construction Labor Union, which were integrated in 1999. The study compares and analyzes their present conditions of the system operations, major activities and opinions on the solidarity, through the questionnaire and interview surveys.