a court case supporting private business' right to censorship?

im doing a paper about walmart's right to censor the music they sell and i need a court case that backs up my argument. i dont know if i am just searching the wrong terms or what but i cant find many court cases in general. there has to be something out there that supports a private business' right to censor what the sell or even their employees. that would even be enough for me to argue with. any help would be greatly appreciated.
 
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