First Amendment Rights

What led up to that being necessary?

Except, that happened in 1969 and he was gagged for constantly interrupting the trial.
You don’t know squat.

She’s a lib, so not knowing squat is par for the course

What does MAGA have to do with it?

Maybe gagging Marxist Bobby Seale in a courtroom of Justice, Makes Amerika Greater Again ?
For Social Justice, of course, in a Constitutional Justice Court of Law administering the rule of law over the perpetrator on trial, mind you.

Bobby Seale, seriously ?

"Seale co-founded the Marxist–Leninist and Black power political organization the Black Panther Party (BPP) with fellow activist Huey P. Newton" -wikipedia biography

John Wayne called High Noon the most UnAmerican Thing He'd Ever Seen in 1952. Bobby Seale had yet to form the BPP. One can imagine the BPP surpassed even High Noon to a HUAC supporter like John Wayne. John Wayne, who was associated with the Motion Picture Alliance for the Preservation of American Ideals and said he would "never regret having helped run Foreman out of this country"

Bobby Seale in the Context of his time was a RADICAL in every sense of the word.
He was Patrisse Cullors with Guns.

Blacklisting for a "non-bright" shade of Red, was to silence traitorous speech to the USA.

https://en.wikipedia.org/wiki/Carl_Foreman
https://www.trumanlibrary.gov/education/presidential-inquiries/house-un-american-activities-committee

Frankfurt School in East Block Germany professor of the New Left, Critical Theorist Herbert Marcuse had a protege', Professor Angela Davis that he trained in social organization tactics,
on the Soviet Side of the East Berlin Wall. Marcuse had some cohorts, including Ernst Bloch.

These Marxist-Leninist idealists were persecuted in Germany by
the Axis War Machine; yet found a place at the forefront of the table as The Wall In Berlin Was Built.
These were Komrades of the USSR and fomented the Cold War in their Universities.
Angela Davis bought GUNS for the Violent Uprising of the BPP as they robbed a bank and took hostages for their cause. RONALD REAGAN was correct about Angela Davis Marxist loyalties.

This vile movement, has through Critical Theory, developed Critical Race Theory & DEI as a Marxist
infiltration of ALL the USA institutions. Universities, Government Union Leadership, Local School Boards, and State, County, and Municipal governments across the USA. These Radicals have taken charge of the Democrat Party from any sensible centrists that used to exist.

https://en.wikipedia.org/wiki/Marin_County_Civic_Center_attacks
"The event received intense media coverage, as did the subsequent manhunt and trial of Angela Davis, an ousted professor from UCLA with connections to George and Jonathan Jackson, and the Black Panthers. Davis owned the weapons used in the incident"
https://en.wikipedia.org/wiki/Soledad_Brothers
...free Davis from jail in 1971.
John Lennon and Yoko Ono contributed to this campaign with the song "Angela".
In 2006, Bobby Seale appeared in the documentary The U.S. vs. John Lennon to discuss his friendship with John Lennon.

Bobby Seale "Free Speech" is Bound to The Kremlin and advocated for inspiring in others, to perform very Violent Actions, allegedly. In the USA, Free Speech protections do not protect inciting violence. Sorry about the self inflicted necessity of Bobby being gagged in public.

"Komrade Seale" may have been afflicted with Diarrhea of the Mouth for inciting Violence.
All to bring about The Utopian Dreams of Marxist Caucasian Komrades of the Kremlin.