They refer to the same thing. It is more properly spelled 'protestor' but the 'er' ending is also in use. It is the same rule as applies to 'councillor' (not counciller) and 'advisor' (not adviser) and 'advisory' (not advisery).
Demonstration a method of teaching by example rather than simple explanation while a protest expresses a strong reaction of events or situations.
A protest is a a person or group stating their objections to a situation or subject
A strike is the with holding of labour when in an employment situation
Many people (both men and women) knew that most of the protesters were draft dodgers (by virtue of their age and gender). Communist >>NovaNet<<
A majority of protesters are not always black. A group can vary in race and depends on the reason of the protest. Protesting has taken place on Wall Street, Washington and in cities throughout the country.
President Hoover sent in General Douglas MacArthur to clean up the aftermath of the Bonus Army protests in Washington D.C. in 1932. MacArthur used military force to disperse the protestors and their encampments, resulting in violence and the destruction of the protesters' makeshift campsites.
Radical protestors during the Vietnam era often burned their draft cards. American involvement in Vietnam began in 1955, and the war ended in 1975 during the presidency of Gerald Ford.
The possessive form is the protesters' opinion.
Labor unions
Protesters lowered the morale of US servicemen. It also caused anger between the two groups. At times, resulting in physical altercations. Protesters detracted alot of time from normal law enforcement activities; instead of patrolling the neighborhoods, they would have to conduct riot control.
The protesters in Libya, who are inspired by the protesters in the neighboring countries of Tunisia and Egypt, are calling for democratic reform.
Yes, they do still use violence like the suffragettes did. For example the recent London protestors threw bricks throught offices windows campaigning against the credit crunch as they lost their jobs. Also terrorist bombers use violence to protestagainst evil in the world etc...
Core Protestors
In 1971, the police officers of Palo Alto, California obtained a search warrant of the main office of The Stanford Daily. The police were looking for evidence (pictures) involving a violent fight between the police and a group of protestors. This case involved the police and the Standard Daily because it was said that they held pictures proving this incident happened. The pictures were needed to prove who the assailants were. pictures of a violent clash between a group of protesters and the police; the pictures were needed to identify the assailants.
The Whiskey Rebellion was a tax rebellion that happened in the colonial United States. It changed the way the government handled protesters as they started to use military suppression.