GLADSTONE residents had a mixed reaction to the industrial action, with many people condemning the behaviour of those who caused damage and used indecent language.
But some supported the workers in their fight for better conditions.
Bechtel condemned the action but said work hadn't been interrupted on the island.
Reports from comments on The Observer's Facebook page and website ranged from people being affected on their way to work, to family members dealing with verbal abuse and illegal activity.
The CFMEU has denied the claims.
Police reported one broken bus window and several people who were given notice to move on, but even workers said some men acted like animals.
Owen Jack wrote: "Turning up pi**ed and spitting on blokes and abusing blokes' mrs who dropped them off really does a lot for credibility. We are supposed to be garnering support from the community, not acting like animals."
Louisa Bradley wrote it "messed my partner up getting out to work today. He even left earlier from seeing comments on (Facebook page) Gladstone classifieds at 5am".
Julie-Anne Schulz wrote "picketing should be made illegal".
"These idiots don't stop to realise that non-Bechtel & non-island workers need to get to work. They don't just stop their work, they stop other businesses too," she wrote.
But Wayne Dunseath said people who haven't had anything do with large companies in negotiation discussions during EBA meetings "do not have any idea what goes on".
"These men and women who have taken this action is to push the company back to the table. These actions are court approved and legal," he wrote.
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