The big controversy going on with Brett Favre and the Packers recalls two similar situations involving former Vikings quarterbacks Joe Kapp and Fran Tarkenton.
Both of the cases indicate how poorly these disputes can work out for players.
Kapp played three seasons with the Vikings and took them to the Super Bowl after the 1969 season, where they lost to the Kansas City Chiefs.
However, even though he had a contract with the Vikings, Kapp left the team at the end of the 1969 season in a contract dispute that turned into a lawsuit when his West Coast agent tried to prove that the NFL contract was illegal.
Kapp was declared a free agent, but again his agent fouled things up, refusing to have his client sign a standard NFL contract with the Patriots, who wanted to add him to their roster. Kapp's agent filed a $2 million lawsuit against the NFL and Commissioner Pete Rozelle, and the court ruled in Kapp's favor.
The court's decision was that the NFL violated antitrust laws, but the attorneys for Kapp couldn't prove that he was damaged.
The Vikings tried to get him back, but he never played in the NFL again.
Then there was the case of Tarkenton, who was with the Vikings from 1961 to '66 and then refused to return for the 1967 season if Norm Van Brocklin was the coach. The Vikings traded Tarkenton to the Giants, and after the trade was made Van Brocklin was fired and Bud Grant became the coach. Tarkenton would have gotten his wish had he stayed.