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I am sorry to hear this has happened to you. Unfortunately, government property cannot be subject to a contractor's lien. However, all government contractors are supposed to have construction bonds when they take out these contracts
so you need to find out who the bond company was on the project, which is a matter of public records with the contract, and you need to file a claim with the bond company for your wages due. You can also sue the construction company for wages and seek to place liens on their property/equipment for the wages.
These are your options. The bond company should be your first step and then seeking to place liens on the construction company's equipment if they own any.
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