One form of online vandalism is operations, which interfere with or disrupt systems to protest the operations, policies, or actions of an organization or government agency

The answer is hacktivist operations.

Explanation:

Hacktivism refers to the fact of abusing of a computer system or network because there are involved social or political reasons. A hacktivist usually utilizes the same tools as well as techniques. This means that they work as a hacker.

They use the same tools and techniques because in this way they can disrupt services and get attention related to a political or social cause. Hacktivists are usually individuals but they can also be groups that work in a coordinated way. Hacktivism is considered a way through which hacktivists express that they disagree with a specific thing.  

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