So sorry this is happening to you; very upsetting. I am a faculty member. Let me tell you, if I received 60 emails, or 30, or 15, I would not like it. You have already received some good advice. Let me build on it: 1) Calm down 2) Collect your thoughts 3) Elect a spokesperson for your group. Pick the person with the calmest, most professional presentation style; not the most agressive, or "in your face", but someone who is personable, can think on their feet, and speaks well. 4) Write down the concerns in a rationale way 5)Schedule an appointment with the professor. Only one person goes. Faculty does NOT feeling "ganged up on". You can bring the names of the students who concur with your position, but petitions come across as hostile. 6) If the meeting goes well - thank the professor. If it doesn't - thank the professor. Then, schedule a meeting with the Chair/Dean. You can win this. This is an exercise in change (remember Change Theory? This is why you learned it!). Good luck.