What you are talking abt is a different matter. Yet again, if other are doing the work, same quality at same pay, then its a fair wage according to the market..And so the workers demand is not justified..And the owner is justified in his decision.
What the reaction of the employees will be:-
1) Act offensive, try to harm the employer--in which case the police will lock them up.
2) Harm new employees:- police again.
3)Adjust work hard and earn the increment:- the employer will happily give them an increment. If he doesnt, they can find work at other place, work hard and earn that increment at some other place..in such a case, the employer will be at a loss not the employee..

cause the employer will be loosing good workers..