The biggest thing that separates union from non-union workplaces is the collective agreement.
In non-union workplaces, employees are often at the mercy of managers who play favourites and change terms and conditions of employment on a whim.
In a unionized environment, workers have written and legally-binding guarantees covering things like wages and benefits. Collective agreements give union workers rights and protections that are not available to non-union workers.
You can see GSU’s collective agreements at www.gsu.ca under the Collective Agreement heading.