There are court decisions defining the scope of the 1st Amendment. There are no valid laws restricting it, since the 1st Amendment is in the Constitution and no law can supersede the constitution. Such laws that are written and passed are unconstitutional.
Edit: The above is mistaken. A law can restrict the 1st Amendment, or any other, if it survives "strict scrutiny":
Although "strict scrutiny leaves few survivors" and will usually strike down such laws when strict scrutiny is found to apply, "the government must show that there is a compelling, or very strong, interest in law, and that the law is either narrowly tailored or is the least restrictive means available to the government."
They do. I have seen news in Europe where they cannot reproduce the original excerpt (reading aloud instead) of some communication because of copyright laws and the original excerpt belonged to a competing media corporation that had won previous such cases in court.
There you have a bunch of examples. Free speech in the US is restricted. That's the point I was making. You can be okay with the restrictions in place but you cannot ignore that they're there. That's just factually wrong.
In a roundabout way libel and slander laws are a violation of the first amendment.
They're civil actions but it's the government through the courts that finds you guilty and imposes punishments, seizing assets, etc. It's very hard to win cases on those things as the judiciary does its best to still make it work within the structure of the constitution but it does nonetheless restrict my ability to say "viro eats kittens" without possible penalty imposed by the government.
Edit: The above is mistaken. A law can restrict the 1st Amendment, or any other, if it survives "strict scrutiny":
Although "strict scrutiny leaves few survivors" and will usually strike down such laws when strict scrutiny is found to apply, "the government must show that there is a compelling, or very strong, interest in law, and that the law is either narrowly tailored or is the least restrictive means available to the government."
https://mtsu.edu/first-amendment/article/1966/strict-scrutin...