Identify significant Supreme Court decisions on First Amendment rights.

There have been so many of these that there is no way to put a
significant percentage of them on here. For
example:

• Lemon v. Kurtzman. This was a case having to do
  with the Establishment Clause. It set up a test to determine what government actions that seem to
  favor religion are actually acceptable.


• Miller v. California. This
  one also set up a three part test. This one determines what things are and are not
  obscene.


• Johnson v. Texas. This one struck down a law against flag
  burning.


• Near v. Minnesota. This one said that governments
  cannot, in most circumstances, exercise "prior restraint" to prevent a newspaper from publishing
  something.

Again, there are so many more that have been
very significant, partly because there are so many aspects of First Amendment
law.