This present study focuses on becoming a union member and organizing the unorganized workers with focus on Shop and Distributive Industry in Nigeria. Specifically, it investigates the conditions that influence workers' decision to join a trade union, and whether workers' organization provides collective voice for the workers in the workplace in relation to representation and participation and how union membership affects overall conditions of employment. Three research hypotheses guided this investigation and one hundred questionnaires were distributed to employees and union leaders in the Shop and Distributive industry. Out of these 100 questionnaires, 93 were fully completed and returned, thus representing 93% response rate. The reliability of the research instrument was 0.854 using Cronbach alpha technique. A descriptive and multiple regression analysis were employed in the analysis of data and hypotheses were tested at 0.01 and 0.05 significant level. The result showed that support for workers' organization has a significant relationship with poor conditions of work (F = 28.952, P > .001), workers' organizing decision has a significant relationship with the need for employees' voice (F = 27.919, P > .001), and union membership and improved working conditions are significantly related (F = 10.389, P > .001)