What are the laws and regulations for the relocation of immigrants? I want to know the national policy document.

There are laws and regulations such as Land Management Law and Regulations on Expropriation and Compensation of Houses on State-owned Land.

For illegal demolitions, water and electricity cuts, etc., you can complain to the higher-level Commission for Discipline Inspection and Supervision, the State Council Office for rectifying the situation, and the government.

Of course, the most fundamental solution is judicial channels. You should collect written materials to explain who forced the demolition and who cut off water and electricity, which caused you losses so that you can sue in the future.