A, B, C, D, E and F cannot be prosecuted in any federal venue, i.e. Louisiana or some other state you did not mention.
They cannot all be listed on one conspiracy indictment without additional facts allowing this.
Graduate from law school or go to your local library. They call all be prosecuted.
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It appears that E, F, and C are involved in one conspiracy; and D, F, A, and B are involved in another conspiracy. F's purchasing from D and E separately, considering that D and E do not know each other, is insufficient to transform these two conspiracies into one. A conspiracy can be prosecuted in any district in which the agreement was made or an overt act in furtherance of the conspiracy was committed, but note that a mere buyer-seller transaction is not a conspiracy (if B buys from A for personal use, B is not a co-conspirator).
Joshua Sabert Lowther, Esq.
NATIONAL FEDERAL DEFENSE GROUP
Yes, maybe and maybe no. The AUSA's who are investigating the case will decide as a team with their supervisor's approval. Conspiracy cases are much more complex than your hypothetical.
Of course, every answer or response is based on the information provided in the question asked and requires a much more complete context than is available in this public forum. This answer/response should NOT be relied upon to make any legal decisions. Seek the advice of an experienced Federal and/or state criminal defense attorney in your jurisdiction BEFORE you say or do anything.