A few days ago, ESPN published a story outlining contract disputes between Luminosity Gaming's Counter-Strike: Global Offensive team and SK Gaming.
The story explained that the players signed a contract with Luminosity Gaming in December last year, but then entered talks with SK Gaming via email in February, which resulted in the players signing contracts with SK. Those contracts are meant to go into effect on July 1.
Ultimately, the players decided to stay with Luminosity. In return SK threatened to pursue legal action against them.