What Unsupervised Machine Learning algorithms can be used to detect Fraud in insurance? I'm about to start a project regarding Fraud Detection in Insurance but there is no dependant variable to train the model and classify it.

Please provide the algorithms that I can use to detect Fraud in both Auto and Health insurance industry.

Thanks in advance!
Fraud, by definition, is a supervised concept.

No unsupervised algorithm will reliably detect this. At best you'll get some suspicious cases with unsupervised approaches such as anomaly detection.