(Bloomberg) -- A group of Dish Network Corp. creditors sent a letter to the company’s board alleging that the satellite television provider’s restructuring plan is illegal, and threatening legal action if the deal isn’t reversed, according to people with knowledge of the situation. Most Read from BloombergHedge Funds Rake in Huge Profits Betting on Catastrophe RiskPutin Orders Hunt for Property of Russian Empire, Soviet UnionTrump’s 2016 Win Shook Markets. Traders Won’t Get Fooled Again.Burger K