Mondal is in the fray for Phulbari seat against Binoy Ghosh of BJP, SG Esmatur Mominin of the NPP and independent candidate, Mark Goera Marak.
Some Facebook users have been allegedly spreading defamatory statements against the Speaker, accusing him of stealing CGI sheets meant for distribution by the Housing Board.
"They are trying to influence voters through accusations and it is not fair. I have reported the matter to the police on Saturday and hopefully those behind it will be caught and given due punishment," said Mondal when contacted.
"We have also sought details from Facebook about the accounts and its holders after which legal action will be taken," said Dr Kumar.