Charges have been laid over “vile” CFMEU protests as an LNP-sponsored attack ad in Opposition Leader Tim Nicholls’ safe Brisbane seat seeks to tie his Labor opponent to the controversy.

The electoral commission is looking into whether the flyer, labelling Labor candidate for Clayfield Philip Anthony “Your Local CFMEU Champion” complies with the Electoral Act, after complaints from Labor supporters.

An election flyer attacking Labor candidate for Clayfield Philip Anthony. Credit:Fairfax Media.

The ad highlights CFMEU members' threats to rip out the spines and “rape” the children of workers who refused to strike at Glencore’s Oaky North mine and has been labelled "defamatory" by the solicitor candidate.

The letterbox drop came as Mr Nicholls continued to ramp up his attack against Labor, having started the Queensland election campaign warning of a personal and dishonest scare campaign from Labor.