Use the remedy that the malls and certain stores use..... Play some Barry Manilow or other suitable uncool music (with the hip junk crowd) on a low level but loud enough to to be clearly heard. (Get your neighbors to approve and it will go over even better).
Do not stop playing the music every time they gather until well after they leave... A couple of weeks and they will all be gone after being overwhelmed by the uncool.
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Molon Labe
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