die Gewalttat
violent crime
A criminal act in which physical violence is used against one or more people.
Die Polizei ermittelt nach der brutalen Gewalttat am Bahnhof.
The police are investigating after the brutal violent crime at the train station.

violent crime
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violent crime
A criminal act in which physical violence is used against one or more people.
Die Polizei ermittelt nach der brutalen Gewalttat am Bahnhof.
The police are investigating after the brutal violent crime at the train station.

The word is a clear compound of 'die Gewalt' (violence) and 'die Tat' (act/deed). So it literally means an 'act of violence'.
Jede Form von Gewalt ist inakzeptabel.
Every form of violence is unacceptable.
The most common verb used with 'Gewalttat' (violent crime) is 'begehen' (to commit). You 'begeht' a 'Gewalttat' (commit a violent crime).
Der Täter hat eine schreckliche Gewalttat begangen.
The perpetrator committed a terrible violent crime.
This word belongs to formal language and is used mainly in news reports, police reports, and legal contexts.
Die Zeitung berichtete über die zunehmende Zahl von Gewalttaten in der Stadt.
The newspaper reported on the increasing number of violent crimes in the city.
violence / authority / force
'die Gewalt' and 'die Gewalttat' are closely related, but they are not the same thing. 'Gewalt' means the use of physical force to injure, harm, or force someone. The word describes more the means or the behavior. 'Gewalttat' means a specific criminal act in which violence is used against people. So you can say that in a 'Gewalttat', 'Gewalt' is used. Learners can easily confuse the words because both appear in news reports and police reports. If you are speaking generally about physical force or coercion, use 'Gewalt'. If you mean a single criminal offense, 'Gewalttat' fits better.

Nach der Gewalttat sucht die Polizei nach Zeugen.
After the violent crime, the police are looking for witnesses.
In der Schule sprechen die Jugendlichen darüber, wie man Gewalt vermeiden kann.
At school, the teenagers talk about how violence can be avoided.