The Labour Party has furiously hit back at the Conservatives over abuse suffered by several MPs during the 2017 General Election.
The Opposition has claimed the Tories ran a campaign full of "smears and untruths" against Labour, with Diane Abbott and other women MPs being particular targets.
This comes as a response to Theresa May's claim of her surprise Jeremy Corbyn hadn't spoken out against the alleged abuse directed at Conservative MPs during the election.
May said she was "surprised" Corbyn hadn't acted, after Tory MPs such as Sarah Wollaston and Sheryll Murray spoke about the abuse they had suffered.
Labour has replied with an open letter, highlighting Zac Goldsmith's London Mayor campaign - which was regarded in some quarters to be racist against fellow hopeful Sadiq Khan - as well as the recent suspension of Anne Marie Morris for use of a racist slur.
Labour claimed the Tories had made personal attacks on MPs a "core component" of the national campaign, and said such incidents deterred many potentional political hopefuls from entering the field.
The letter, sent by Labour chairman Ian Lavery to his Tory counterpart Patrick McLoughlin, said the Conservatives were guilty of abuse on “an industrial scale by spending millions of pounds to post highly personalised and nasty attack adverts on voters' Facebook timelines without their permission."
The letter was signed by Labour's shadow minister for voter engagement, Cat Smith.