Dawn Butler has said she will report Mumsnet users who sent her abuse after she sent messages of support to the family of murdered teen Brianna Ghey.
The Labour MP said she would refer the message board to the authorities after she claimed to have received messages from "nasty, vicious, inhumane" people.
Butler had taken to social media to suggest that the murder was driven by transphobia.
The 16-year-old transgender teenager was stabbed to death in Warrington, Cheshire in February this year by two teenagers. The two were found guilty earlier this week.
Dawn Butler reports vile Mumsnet users to police after wading into Brianna Ghey case
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Butler shared a video of Ghey's father Peter Spooner outside court on Twitter, saying: "This cruel Government has created so much hate towards the trans community they should be ashamed."
However, the comments were criticised by Mumsnet users who accused her of "crowbarring" in "virtue signalling".
Other users accused Butler of "weaponising" Brianna's shocking murder, calling her remarks 'gross' and "political point scoring".
Butler then posted: "Oh I wondered where these nasty vicious inhumane people were coming from. Time for me to unfollow and report Mumsnet to @metpoliceuk."
Mumsnet then responded to Butler's comments, saying: "Hi Dawn, our talk guidelines are clear and we don't permit posts that break the law, including hate speech.
"If you've seen a post that you think falls into this category, please do report it."
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Esther Ghey made a statement after Boy X and Girl Y were found guilty of Brianna's murder
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In a further statement to MailOnline, a spokesperson from Mumsnet said: "Our forum guidelines are pretty clear. We allow legal discussion, which sometimes means people will make comments that individuals don't agree with or like.
"We specifically disallow hate speech and deliberately inflammatory posts and we have an active moderation team who respond, on average in under an hour, to complaints about posts.
"It's somewhat ironic that Ms Butler chose to post her attack on Mumsnet on X (formerly Twitter) which regularly hosts comments that wouldn't last a moment on Mumsnet and where the moderation is light touch at best.
"We see this kind of double standard a lot and I'm beginning to wonder if it might be because Mumsnet is the only major platform dominated by women's voices."
GB News has contacted Ms Butler and the Metropolitan Police for a comment.
Brianna Ghey’s killers to be named as judge to lift court orderPAOfficers investigating the case said they do not believe the crime was motivated by transphobic hate, however they added the fact that Ghey was transgender made her "more vulnerable and accessible."
Her killers, who are set to have their identities revealed in February, had drawn up a "kill list" featuring four other children, while one had expressed a fascination with serial killers.
After one of them suggested they stab Brianna, the other agreed, saying: "Yeah, it’ll be easier and I want to see if it will scream like a man or a girl."
Text messages sent by one made reference to Brianna's transgender identity, including referring to her as "it", asking whether she was a "femboy or a t*****? [a transphobic slur]"