Finding a Chinese language protest song and its lyrics

Hello. I'm looking for a song in this video. It's sung by migrant laborers in China. I don't think the video shows the full song. A certain 新勞動者藝術團 performed this in 皮村, a settlement just outside of Beijing. And I wonder if anybody knows the title and the lyrics of the song, that would be grateful. Thank you.

submitted by /u/RespublicaCuriae
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