First let's start here:

Science: There is no liberal media bias in which news stories political journalists choose to cover

https://www.science.org/doi/full/10.1126/sciadv.aay9344

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Trade-offs between reducing misinformation and politically- balanced enforcement on social media.

https://psyarxiv.com/ay9q5

I.e. Analyzing Twitter suspensions shows that users’ sharing of links to misinformation sites was as predictive of being suspended as was the users’ political orientation. "Conservative" accounts share more misinformation, and violate with greater frequency policy rules.

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And next, you might in response link this article:

https://quillette.com/2019/02/12/it-isnt-your-imagination-tw...

A study that although argues twitter has a bias, readily admits in it's data sampling that the banned/suspended accounts violate terms and conditions at a mich higher rate.

Reasons listed for banning these individuals in Hanania’s own data sheet include “violent threats,” “harassment,” “inciting violence,” “targeted abuse,” “doxxing,” “pro-Nazi tweets,” and “racist slurs.” Additionally, about a quarter of the accounts listed are still active and no longer suspended.

Kicking off a bunch of Nazis and trolls isn’t very compelling evidence that your average conservative is getting unfair treatment on Twitter. The majority of the “victims” here seem to have been engaged in abuse, and it’s reasonable for a private company like Twitter to kick off people who are undermining the quality of their platform by harassing or threatening other users.

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Lastly:

" We then investigated potential political bias in suspension patterns and identified a set of 9,000 politically engaged Twitter users, half Democratic and half Republican, in October 2020, and followed them through the six months after the U.S. 2020 election. During that period, while only 7.7% of the Democratic users were suspended, 35.6% of the Republican users were suspended. The Republican users, however, shared substantially more news from misinformation sites – as judged by either fact-checkers or politically balanced crowds – than the Democratic users. Critically, we found that users’ misinformation sharing was as predictive of suspension as was their political orientation. Thus, the observation that Republicans were more likely to be suspended than Democrats provides no support for the claim that Twitter showed political bias in its suspension practices. Instead, the observed asymmetry could be explained entirely by the tendency of Republicans to share more misinformation."

https://www.benton.org/headlines/twitter-biased-against-cons...

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“We were surprised,” says González-Bailón, an associate professor in Penn’s Annenberg School for Communication. “Previous work has documented that Twitter users tend to have a liberal bias. But we found that across the board, the news most often shared has a right-leaning bias. This increases the visibility of conservative voices, even in the context of protest mobilizations with liberal goals.”

https://penntoday.upenn.edu/news/Penn-research-Twitter-gives...

Research paper: The advantage of the right in social media news sharing

https://academic.oup.com/pnasnexus/article/1/3/pgac137/66516...