Arrest warrants were issued for suspects like Trevor Judge who was taken into custody in Yellow Springs.
Officials said at that arrest site they found a handgun, some firearms and marijuana.
Greene County's ACE Task Force teamed up with other agencies around the Miami Valley.
By late afternoon Wednesday, eight of the 19 arrest warrants had been served successfully.
Police said three other people who were not on their list were arrested.
They said they recovered quite a few weapons and large quantities of crack cocaine.
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