OK, your second post does describe the use of this law in the Detroit Public School system.
So now that I know what you’re talking about, you asked:
Maybe.
As a starting point, states have plenary power, while the federal government has supreme but limited, ennumerated powers. Basically, this can be thought of as:
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The federal government can only do what the Constitution says it can, and nothing else
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The states can do whatever they want, unless the federal Constitution says they can’t
In this case, the state passed a law saying that under certain circumstances, the state government can modify or abrogate its contracts. This appears to conflict with Art I, Sec. 10 of the US Constitution.
Although this is not my area of law, I don’t believe it actually does conflict with that mandate, though, as we learn from Phelps v. Board of Education of the Town of Wesk New Work, 300 US 319 (1937).
In Phelps, the Supreme Court considers a similar situation: the existing contract with teachers provided that once they had passed three years’ employment, “…No principal or teacher shall be dismissed or subjected to reduction of salary in said school district except for inefficiency, incapacity, conduct unbecoming a teacher or other just cause…”
Nonetheless, as a result of “existing economic conditions” (which I take to refer to the Depression) the state legislature in 1933 passed a law empowering local school boards to assess the salaries of employees “notwithstanding any tenure.” The teachers complained, and the Supreme Court upheld the ability of the state legislature to act as they did.
I welcome correction or edification from someone more versed in this area of law, but that’s my initial take on it.