A rebel.
A traitor
1. Call an ambulance2. Call the police and bring charges against that person.
A traitor.
engineer
Abolitionist -- they were in favor of abolishing slavery.
Protagonist
A person who goes against the flow (of society, their community, their established culture, and so on) might be called a nonconformist.
Proponents of Enlightenment
A bacteriologist.
When one person plays chess against many opponents at the same time is called a simul.
A lighting engineer
Defector, Traitor, Double Agent.