Because the British kept on taking away more of there rights and they were doing taxation without representation which basically means that they were taxing the colonist without the colonist having a representative over in Britain to speak for them.
When workers form a union, they are exercising a basic civil right. ... The statutory right to form a union and engage in collective bargaining is necessary to ensure that workers can continue to exercise their civil right to associate with other workers on issues of mutual concern.
In which country? England --> It led to liberal reform acts and improved the economy.