Here in Ontario, it has been illegal for part-time college teachers to unionize. A ruling in BC last year made it clear that that would have to change. The Ontario government commissioned the Whittaker report, which recommended bargaining rights for these teachers. OPSEU, the union that represents full-time teachers is now applying to be recognized as the agent for part timers as well. Most college English language teachers in Ontario are part-time employees. More here.