1. Introduction  
2. The Sample  
3. Are the Broad Lines Really Missing in the HIGs Spectra?  
4. Geometry of the Obscuring Torus  
5. Radio Properties and the Unified Model  
6. Size of the Radio Sources and the UM  
7. Narrow Lines Properties  
8. Low Ionization Galaxies and the Unified Model  
9. Discussion  
10. Summary and Conclusions