The comments left by Hanson were made in October, authorities said.
On Oct. 2, he used the username "@anonYmous" to comment on Merriam-Webster's dictionary entry for the term "female," authorities said.
“It is absolutely sickening that Merriam-Webster now tells blatant lies and promotes anti-science propaganda. There is no such thing as ‘gender identity.’ The imbecile who wrote this entry should be hunted down and shot," he allegedly wrote.
It is alleged that in a message sent to Merriam-Webster via the "contact us" function, Hanson wrote the company had altered "the definition of ‘female’ as part of the Left’s efforts to corrupt and degrade the English language and deny reality."
"Your headquarters should be shot up and bombed. ... You evil Marxists should all be killed. It would be poetic justice to have someone storm your offices and shoot up the place, leaving none of you commies alive," he allegedly wrote.