on my first day as driver for this company i was told to keep a large cup with me to use to urinate into in the back of the truck, because we do not have time to stop for a bathroom break. I belong to a union, but the union stewards also use a urinating cup too. I have talked to our union officials and they say they do not want to pursue the matter because in the end I would lose and that I should just keep my mouth shut and do as instructed to keep my job. What type of lawyer would I need and what do I need to do to stop this treatment?
You need an employment and labor attorney to handle this. The union is required to take any grievance you have to the company on your behalf. This practice has a discriminatory impact because of female workers not having the ability to use a restroom.
This requirement could rise to the level of sexual harassment and sex discrimination. Find a local employment attorney to represent you to the union and company.