A group of individuals from a technologically advanced alien race have been found to be intellectual dissidents by their peers and exiled to Earth as a consequence.
Earth was selected as the location of their sentence as it happens to be hospitable for their species and the convicts have been given some technologies (detailed below) to help them make a new life for themselves on earth.
These aliens are not humanoid. They cannot disguise themselves as people. Furthermore they do not want to reveal themselves to humanity at large, thus they must stay hidden from the general population. They are however willing, if not terribly keen, on interacting with small groups (such as government officials) as long as they believe their existance will not be divulged publically.
The aliens are essentially entirely carnivorous and the entire group requires about 60,000 kilograms of meat to sustain itself per day. They were not given technologies to synthesize artificial meat, nor were they given herds of animals to farm. Furthermore because of certain ethical and cultural considerations, they wish to live in harmony with their habitat and thus they greatly prefer to kill/farm/consume species which they deem as "invasive/"unchecked", species which are causing untold havoc to the ecosystem. This (unfortunately for us) happens to be, according to them, humans.
So the question remains, how will this group of aliens harvest and ship 60,000 kilograms of human meat (when you account for all the non-meat part of humans beings that adds up to about 2000 individuals, by the way) per day to the hidden central location where they all live?
They have settled in a large underground cavern which they themselves created located in Nevada, USA.
The technologies they possess include advanced computers capable of translating mostly accurately any human language, hacking any website/online service with low to medium level security and running calculations dozens of times faster than Earth super-computers.
In addition they have extremely advanced batteries which should be able to fuel their small-society for centuries and the ability to manufacture dozens of androids which can be customised to exactly copy the likeness/speech of any human and which possess the software needed to engage in basic inter-personal interactions.
They can create bioweapons and artificial viruses.
The aliens have rather extensive knowledge on physics (FTL travel, wormhole creation) and engineering (fusion reactors, robotics).
They would prefer to eat healthy human beings (no eating sick or elderly if at all possible; extra credit to answers which do not require them to do so).
These aliens have no qualms with majorly distorting the status quo. They can use their influence to topple governments, inflict worldwide/nationwide plagues, etc...