I knew the song was by Patterson Dave, but never heard the Chinamen version.
Josh obviously adapted it for 1960's audiences.

Got this as Banjo's original.
3. I asked a cove for shearin' once along the Marthaguy,
    "We shear non-union here," says he, "I call it scab," says I,
    I looked along the shearin' floor before I turned to go -
    There were eight or ten non-union men a-shearin' in a row.