My first riddle ever!

All the night he watches

To all things he ataches

He is fast and silent

with the mind on science

He takes care not to be caught

And many men he bought.

He works for the police

But they never give him peace,

Because he still is a thief

In a really dark reef.

He is lonely like a leaf,

but when he atacks he let's alot of grief.

They are the master minds of our new world what are they?