Workers from a liquid gas project in Western Australia have been fined after their industrial action was found to be unlawful.

The construction workers’ union says it is a sign of things to come under the Abbott government, fearing that the new regime will lash-out at unionists and others seen to impede the path to commercial productivity.

A recent Federal Court finding has handed fines to more than 100 workers who walked off the job at the site of Woodside's LNG expansion project in 2008. They have been charged figures from $1000 to $10,000 each.

Mick Buchan, West Australian secretary of the CFMEU, says he believes the new Federal Government will take a hard line on striking workers, which has promised to bring back the Australian Building and Construction Commission.

“Let's remember Abbott was one of the major players in setting up the ABCC originally,” Mr Buchanan said.

“[Prime Minister Tony Abbott] made it quite clear that his regime is going to fall in line and be the same as what was previously installed with the coercive powers of the ABCC and increasing the fines and penalties of workers.”

Employment Minister Eric Abetz has said bringing back the Commission remains a priority for the Coalition Government.