Protest are carried out when group of people believed that they could influence the other party if they would demonstrate and collectively voice their opinion. Mostly protest is carried around the world are done for poor governance system and corruption.
Disagreements are not only done against governments or political structure it can be done for anything which is not positive according to groups of people and they want changes to be made. Many protest around the globe has went to extreme and most of the Disagreement works.
Type and duration are very important while people are out in the street as it represent the signal to the representative to the other leaders what the people actually care about.