Workers who have organized into unions have much more power to make changes than workers acting on their own. This power can be used through collective bargaining to negotiate improved wages and working conditions. The option of calling a legal strike, should negotiations fail, makes it much more likely that worker demands will be met.
I believe its the first amendment since it has 5 components which are 1. free speech 2. assembly 3. petition 4. press 5. religion
