According to my research on cyber security attacks, I can say that based on the information provided within the question the form on online vandalism being defined is called hacktivist operations. These are activists who hack into government or organizational systems in order to protest their policies or actions, and by doing so can severely damage their systems.
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Hacking is the ability to identify and exploit weaknesses in computer systems and/or computer networks. When this is done on systems connected to the internet it is termed cyber hacking irrespective of the reason of the hacker.
