And, it all started when Twitter banned Jared Taylor and American Renaissance from its platform.
Breitbart has a long report on the case.  I think Taylor has a good case, but you know how our court system has become (too often these days) the place where Leftwing ideology has found its home and Constitutional protections are lost, so I won’t dare to predict how this could turn out.
Here is Ian Mason writing at Breitbart about the case filed last week in California:

A group of free-speech lawyers filed the most serious legal challenge yet to Twitter’s censorship policies Tuesday in San Francisco County Superior Court, seeking a ruling preventing Twitter from banning users purely on the basis of their views and political associations.

The 29-page complaint contends that, under a California legal doctrine that recognizes some private facilities as “public forums,” Twitter may not discriminate against speech on their platform based purely on viewpoint. If successful, it would be the first extension of that doctrine to internet social media platforms and could transform the way free speech is treated online. The suit became all the more relevant Wednesday as Twitter stood accused of locking out thousands of conservatives under the guise of cracking down on “Russian bots.”

The genesis of the suit is Twitter’s November 2017 announcement that they would start banning and sanctioning users based on their offline behavior and associations.

On December 18, 2017, Twitter, five years after their top British executive described the company as “the free speech wing of the free speech party,” made good on this threat, “purging” hundreds of mostly right-wing users. Twitter’s new policy refers to association with “violent extremist groups,” and a company blog post claimed, “If an account’s profile information includes a violent threat or multiple slurs, epithets, racist or sexist tropes, incites fear, or reduces someone to less than human, it will be permanently suspended.”

One of those purged is Jared Taylor, founder and editor of “American Renaissance,” a fringe-right journal on race and immigration. He is frequently described as an “extremist” and a “white supremacist” by left-wing groups like the Southern Poverty Law Center (SPLC) and the Anti-Defamation League (ADL), the latter of which sits on Twitter’s “Trust and Safety Council,” the largely leftist group of activists and non-profits Twitter assembled in 2016 to help decide which speech to censor.

Taylor is a graduate of Yale University and Paris’s Sciences Po, the former West Coast editor of PC Magazine, and author of several books. He describes himself as a “white advocate” or “race realist” and condemns Nazism and antisemitism.

According to the complaint, in his more than six years on Twitter, Taylor never made threats, harassed anyone, or otherwise came under scrutiny for his behavior on the platform. Even the SPLC notes Taylor “scrupulously avoided racist epithets [and] employed the language of academic journals” in his writings, and Taylor once wrote an article urging people to be more civil on Twitter.

[….]

Yet both Taylor’s personal account and that of American Renaissance were permanently banned. The only explanation Twitter gave was that the accounts were “affiliated with a violent extremist group.” Twitter refused to offer Taylor any further details including to which “violent extremist group” he was affiliated.

There is much more here.

The SPLC and me….

You might also want to know that the SPLC has gone on another of its media hit campaigns.  See that the Baltimore Sun has listed me as a “hate group” (taking the SPLC’s word for it!) without ever checking to find out that I am a journalist blogger and have no group!
How many more one-person ‘groups’ are on SPLC’s “hate group” list?
LOL! The Sun says Maryland hate groups are “on the rise” as Maryland gains one “hate group” since the SPLC’s list last year.
The SPLC aimed its big-money guns at me after the Hebrew Immigrant Aid Society directed them to my work. Of course HIAS didn’t like anyone questioning their federal funding and their refugee resettlement program.