Yes, in my local suburb there is a dog park where people and dogs have been attacked by off leash dogs

(well behaved off leash dogs are allowed at the park, but we're talking about dogs that have repeatedly bitten people and other dogs, who should not be off leash)

and there are some repeat offenders who have refused to give their name
who have been identified by someone taking a photo and posting it to the local community Facebook group and/or also talking to the local council ranger.