Wallsend MP Sonia Hornery is due to front Sydney's Downing Centre Local Court today accused of improperly gaining access to the electoral roll.
The Electoral Commission received a complaint from a woman who lives outside the Wallsend electorate after she received a letter from Sonia Hornery after pair had clashed on Twitter.
It's alleged the MP obtained the woman's address through the office of Charlestown MP, Jodie Harrison.
MP's are only allowed access to the electoral roll in their electorate.
Sonia Hornery is expected to defend the charge.