In large-scale conspiracies, multiple people can be convicted as being part of the conspiracy without even all knowing each other. For example, in a chain conspiracy, it is highly unlikely that the individual smuggling the drugs into the United States personally entered into an "agreement" with the dealer ultimately selling them at a college fraternity party. Is this fair? Should the prosecution need to prove an agreement between each party beyond a reasonable doubt? Why or why not? Or is this a necessary tool for prosecutors?