Blackmail charges against two senior CFMEU officials hinge on allegations the union imposed a black ban on Boral, a Melbourne court has been told.

Lawyers for unionists John Setka and Shaun Reardon will cross-examine Boral’s chief executive Michael Kane at a two-week hearing in November. Setka’s barrister Robert Richter QC said Mr Kane was an “industrial warrior” and a key figure in what the CFMEU saw as a conspiracy to destroy it. “He is…