NSW construction union boss Brian Parker and nine other officials face heavy penalties after being found liable for unlawful industrial action at Sydney's Barangaroo site where they intimidated a female police officer and called Lend Lease employees "dogs" and latte-sipping "c---s".

The Federal Court on Wednesday found the Construction, Forestry, Mining and Energy Union NSW and its members breached workplace laws by striking at the building site on July 24 and 25 in 2014 after the suspension of union delegate, Peter Genovese. Mr Genovese was suspended after he allegedly pushed and verbally abused a Lend Lease employee.

CFMEU officials face heavy penalties after being found liable for unlawful industrial action at the Barangaroo site. Credit:Peter Braig

Federal Court Justice Geoffrey Flick on Wednesday found CFMEU NSW secretary Mr Parker and other union officials co-erced workers into unlawful strikes that saw about 1000 construction workers walk off the job at the $6 billion Barangaroo project.

During the height of the dispute, union officials were reported calling Lend Lease employees "dogs", "lower than a paedophile grub" and latte-sipping "soft c---s".