This website has great background on the Tauregs...

Basically, many analysts believe that due to class & tribal issues, the Taureg will never be able to create a unified state.

Tauregs have a highly hierarchical social structure. Ifogas (or Iforas) are northern Mali's traditional Tuareg nobles. Most rebel leaders are Ifogas. The Idnane are middle class. There are Idnanes in the MNLA, but in earlier rebellions, the Malian government was able to exploit differences between the 2 classes to split rebel alliances. There are also slave classes, who are often black. They usually have not supported Taureg rebellions.

Here is a link -

[link to www.globalsecurity.org]