Don't want to enter yet another discussion of labels like Moon.
But to get matters straight about Arthur Crudup - It was actually a publishing company, Hill & Range, that reneged at the last minute on paying Arthur Crudup for back royalties. Dick Waterman, in his book, Between Midnight and Day, tells the complete story. Arthur Crudup died shortly after this incident. On his way back from the funeral in Virginia, Dick Waterman spoke with an associate of a lawyer he had used to negotiate a contract for Bonnie Raitt. The lawyer suggested that they file suit to stop record companies from paying further royalties to Hill & Range. Chappell music was in the process of buying Hill & Range, and refused to go forward with the deal unless the legal matter was settled. A deal was reached, and Arthur Crudup's heirs received an initial payment of $248,000. The initial one time settlement that Hill & Range reneged on was for $60,000. Dick Waterman writes that he was present when the first check was issued, and that over the past 30+ years Arthur Crudup's estate has received around three million dollars in royalty payments.
From everything I've read over the years, Dick Waterman comes across as an honest guy, so I have no reason to doubt what he wrote in his book.