fear

Krishna placed Ugrasena on the throne. The 

1. Yadus, 
2. Vrishnis, 
3. Andhakas, 
4. Madhus, 
5. Dasarhas and 
6. Kukkuras, who had left Mathurâ for fear of Kansa, now returned to that town.

https://harekrishnainfo.blogspot.com/search/label/KamsaJarasandhaKalayavana