Australia’s biggest building union is set to be dragged before the Federal Court after the nation’s competition watchdog alleged that it conducted an illegal boycott of concrete from building products supplier Boral across dozens of sites in Melbourne.

In its latest announcement, the Australian Competition and Consumer Commission (ACCC) said it had launched Federal Court action against the union, its Victorian branch and its Victorian State Secretary and Assistant Secretary John Setka and Shaun Reardon over secondary boycott action targeted at the building products maker which followed Boral’s…