As with most things concerning the law - it depends.
What is the definition of "a demonstraion?" What is the size of the "demonstration" (2 people? - 2,000 people?). Where is it being held (e.g.: grounds of Embassies, Consulates, hospitals, etc. are clearly off-limits).
'Ad hoc' demonstrations can be controlled by the decisions of lower level supervisory ranks, but as a general rule the larger a "demonstration" and the more it disrupts the functional operation of the public at large, such decisions are usually made by the political office-holders of the municipality. When they determine that the situation is, or has the potential of, becoming out of control the police are ordered to disperse it.
Never
When they violate the law like anyone else.Added: The only time they are immune from arrest is when Congress is in session and they are actually on the floor of their respective chamber (House or Senate).
demo
monstrosity
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Yes
Kent State University.
food demonstrators
Just part of the war & draft in general. Anytime there was an opportunity for large gatherings of people, demonstrators would try to be there.
de is the prifex and s is the suffix
D. Was controlled by federal marshals
Letter writers tend to communicate their views through written correspondence, while demonstrators express their beliefs through public protests or demonstrations. Both groups seek to have their voices heard and influence change, but they differ in the manner in which they convey their messages.
Russia