Why do employees need to join in trade union?

By joining a trade union, you will have strength in numbers. It will no longer be you against the company, no more waiting for the company to decide you are worth a raise or you having to beg for one. Union members get higher wages and benefits (will not have to count on Social Security). Over the years it was unions that have fought for all workers rights, not just their members (40 hour workweek, child labor laws, minimum wage, . . . and most recently the health care reform [even though most union members already have health insurance, they still fought for the rest of the American people to have coverage]). They have fought for safer working conditions (OSHA).