I don't know what you mean by "hoard the opponent's 'rogue tubes'" or how you plan on causing the opposing alliance to get a penalty, but <G61> states that:
Quote:
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The actions of an ALLIANCE shall not cause an opposing ALLIANCE to violate a rule and thus incur PENALTIES. Any rule violations committed by the affected ALLIANCE shall be excused, and no PENALTIES will be assigned.
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So, your alliance's actions cannot cause your opponents to receive any penalties.
EDIT: Do you mean that you would use the tubes to block robots that are already in possession of a tube since robots may not possess and/or herd more than 1 tube at a time?
If so, note that if the opposing robot just rams through your blockade of tubes, and continues on its way to hang the tube it has without dragging any other tubes with it, then it is not herding those tubes, and won't be penalized.
Blue Box immediately following <G34>: "Inadvertent contact will be not be considered HERDING and will not be penalized."
(Yes, I do know the blue boxes aren't technically part of the rules, but I would still pay attention to them.)