The early 20th century folk song "On the Trail of the Buffalo" tells the story of some cowboys employed by a drover to run buffalo. In Woody Guthrie's 1945 version (video / lyrics) we have this closing stanza:
Well, our working season ended and the drover would not pay
“You et and drunk too much; you’re all in debt to me!”
But the cowboys never had heard of such a thing as a bankrupt law
So we left that drover’s bones to bleach on the plains of the buffalo
I have no background in law, but here are the possible interpretations I have of that phrase:
(My instinctive reading the first time I heard it.) A law that is morally bankrupt. The cowboys have so much good faith that they're shocked that the law would support the drover's claim. Indignant, they put a stop to it by killing him.
A claim or contract that is legally bankrupt. The cowboys don't realize that the drover's claim is indefensible. Since they don't know that a legal challenge is possible, they take extralegal action.
A law having to do with bankruptcy. The cowboys didn't know about a law for the settling of employee debts in this way. Similar to #1, except talking about their legal ignorance rather than expressing moral judgement on the law.
Which one does he probably mean?