There is a potential for the thoughtless music of a few recording labels to brainwash the young minds of the youth. The propaganda in these songs for the rappers benefit is in direct competition with the traditional powers of governments.
ALso, nanotechnology could be used to injur people and spy on them without them knowing it was happening. They could be stripped of their body strength, lose their mind by supplying neuro-toxins to the mind and break connective tissue in the muscles.
This is a scary thought, where we can be killed at home with no warning or commotion to give us time to prepare a defense. If one researcher took home the work it could turn up in nefarious organizations hands to mass kill groups of people or those who don't agree with the aggressors opinions.