Cain is the author of hugely popular mystery novels, including a series called Heartsick. She recently branched out to author Marvel's Mockingbird comic book, which ended on Oct. 19 with its eighth issue. The comic book was praised for its relatable woman hero and its explicitly feminist agenda.

On Oct. 17, she tweeted, "Mockingbird is cancelled. But we need to make sure @Marvel makes room for more titles by women about women kicking ass."

In the same vein, the final "Mockingbird" cover shows the main character with a shirt that reads "Ask Me About My Feminist Agenda" with Portland artist Joelle Jones' artwork.

It's dope.

It was also the reason for some of the harassment.

Cain, a New York Times bestselling author, wrote that she never blocked anyone on Twitter until she started working in comics. On Oct. 21, she wrote a series of tweets expressing the frustration, which is directly related to the comic industry.

Cain was not immediately available for comment, but the situation is still playing out on Twitter and comic blogs.

Marvel Editor-in-Chief Axel Alonso wrote a tweet expressing his support for Cain, as did former Image Comics Director of Trade Book Sales Jennifer de Guzman.

I stand w/ Chelsea Cain, condemn online harassment, and think the MU, and the industry, benefits & grows from diverse creators & characters.

— axel alonso (@axelalonsomarv) October 26, 2016
. @ChelseaCain has been driven off Twitter by misogynists in comics. There are women who have been driven out of comics entirely.

— Fear the Ghoulsman💀 (@Jennifer_deG) October 26, 2016

There's also a #StandWithChelseaCain thread with hundreds of Tweets.

Stop harassing women for being feminists. Stop harassing women for writing feminist characters. Stop harassing women. #StandWithChelseaCain pic.twitter.com/h8yDu2jvd3

— Lauren Manalo (@lauren_manalo) October 26, 2016

One of comic's most influential authors, Gail Simone, who wrote Wonder Woman, Deadpool and Birds of Prey, also weighed in in a series of tweets. Simone has been in the comic industry since the 1990s.

And @ChelseaCain, I have been on that block. Many, maybe most of us have. But I hope you are not done making comics better.

— GARGOYLE SIMONE (@GailSimone) October 26, 2016
And that;s what the scumbags want, it's not to just upset someone, it's to make them quit and discourage others.

— GARGOYLE SIMONE (@GailSimone) October 26, 2016
We need support. Support of the readership, publishers, creative community and retailer base. It's not painful, just leave the door open.

— GARGOYLE SIMONE (@GailSimone) October 26, 2016
I realize that I am in a fortunate position, as are several other female creators. We need to be using that position to keep the doors open.

— GARGOYLE SIMONE (@GailSimone) October 26, 2016