A prominent ally of Kathy Jackson has been accused of shopping around dubious evidence to knock out an election rival as the battle for control of the remains of the Health Services Union again turns toxic.

Crikey can reveal that Marco Bolano, the former deputy general secretary of the HSUEast branch overseen by disgraced and charged Michael Williamson, has written repeatedly to the union's administrator Michael Moore to demand his opponent for Victorian No. 1 branch secretary -- former Darebin council deputy mayor Diana Asmar -- be ejected from the race on eligibility grounds.