YOU SAID:
police policed the police that were policing those that were not the police
INTO JAPANESE
警察は警察ではない人を取り締まっている警察を取り締まった
BACK INTO ENGLISH
Police cracked down on non-police people
INTO JAPANESE
警察は警察以外の人々を取り締まった
BACK INTO ENGLISH
Police cracked down on non-police people
That didn't even make that much sense in English.