Justice/Fairness

I don't understand the difference of the two. Because they are pretty much the same thing.
If someone does something bad to someone else and they find out who it was, there are going to be consequence for them. Or else karma is going to come around and bite you right back for what you have done.
I think the only difference is where justice you have a judge in a court room and fairness is just on the street, its karma. But they're pretty much the same.
That's all I have to say!