The 1st Amendment Says Peaceable Assembly Is A Right, Not A Privilege Or A Permission

"Congress shall make no law respecting an establishment of religion, or 
prohibiting the free exercise thereof; or abridging the freedom of speech, or of 
the press; or the right of the people peaceably to assemble, and to petition the 
Government for a redress of grievances."
- U.S. Constitution, 1st Amendment

"This Constitution, and the Laws of the United States which shall be made in 
Pursuance thereof; and all Treaties made, or which shall be made, under the 
Authority of the United States, shall be the supreme Law of the Land; and the 
Judges in every State shall be bound thereby, any Thing in the Constitution or 
Laws of any State to the Contrary notwithstanding."
- U.S. Constitution, Article VI, Clause 2