President Donald Trump and his allies have promised consequences for people who speak callously about Kirk's killing.
ABC7 Chicago spoke to a constitutional expert about people's freedom to express their thoughts.
In the wake of Charlie Kirk's death, social media has lit up with opinions on both sides of the aisle. Some people have lost their jobs over their posts.
The anger made its way to a Buffalo Grove, Illinois, school board meeting Tuesday night, where some parents are demanding a teacher be fired for her social media comments comparing Kirk's followers to uniformed men at rallies in the 1930s.
"I'm not a Nazi, a Republican is not a Nazi," a speaker at the school board meeting said. "Charlie Kirk was not a Nazi."
"Administrators and teachers do have the right to have a political opinion outside of their teaching hours," another speaker said.
The temperature of the political debate reached a new level this week when U.S. Attorney General Pam Bondi addressed "hate speech'' in America.
"We will absolutely target you, go after you if you are targeting anyone with hate speech, anything and that's across the aisle," Bondi said.
RELATED | Students at Utah Valley University return to campus a week after Charlie Kirk shooting
However, constitutional experts say no matter how hateful speech is, the First Amendment prevents the government from prosecuting someone who engages in hate speech.
"Something like 'Charlie Kirk deserves to die' is certainly protected by the First Amendment, however odious or objectionable it might be," said Professor Jonathon Masur with the University of Chicago Law School.
Masur said it crosses the line if speech becomes a threat to someone's life or incites violence. In addition, Bondi and President Trump have said they will go after left-wing groups.
"They can't go after group because of that group's speech or the speech of any of its members," Masur said. "That's the core of the First Amendment. I mean, that's the core of American democracy."
Facing backlash, Bondi later acknowledged on social media her intention was to target speech that crosses the line into violent threats. Meanwhile, because teachers are government employees, they are also protected under the First Amendment. Although, Masur says courts have allowed a gray area.
"They are going to balance the public value of your speech against the governments interest in having a fire department that functions well or a school system that functions well," Masur said.
Private employers can fire an employee based on free speech. While discrimination is not allowed based on race, gender and other things, the First Amendment does not apply to private companies.