A series of powerful political campaigns will seek to defeat far-right candidates at the federal election as major parties and activist groups warn against the rise of extremism in the wake of the Christchurch terror attacks.

Australians will be urged to reject Pauline Hanson’s One Nation and controversial Queensland senator Fraser Anning amid accusations they have inflamed racial hatred.

The fortunes of the far-right have depended in the past on preference deals with the major parties, but similar arrangements are now off the agenda ahead of the election.

Labor has vowed to put One Nation and Senator Anning last on its how-to-vote cards at the election in May, while the union movement and activist group GetUp! are also preparing to mobilise against right-wing candidates.