Exploitation of labour is wrong. 
First let us define 'exploitation of labor'.  i define it as treating your employees unfairly so that you can gain an unfair advantage over them.  My example here is UBER, which takes 50% of gross and leaves the drivers to pay for their own gas from what is left.
Indeed, Uber and other companies are certainly taking advantage and exploiting their employees. I despise it. We work hard enough for our money. 
ever since the labor organizing and sweatshops of the 1910's and 20's, there has been a fundamental power assemetry between owners and management, on the one hane, and loabor or employees on the other.
When I think of exploitation of labor, I also think of waitresses. As a waitress, I made $2.50 an hour plus tips. The problem with that is, the tips are pooled and split between the waitresses. Even if I did really good, it was split between us evenly. 
Right you are.  The root cause of exploitation of labor is THE CONSUMER.  They demand the lowest possible price and the maximum benefit, resulting in a small pie to be split between owners and employees.
Can you suggest a solution to this problem?
Karl Marx wrote extensively about this. he is considered the most influential theorist of exploitation.  Obama was a Marxist.
That is interesting. I will look Karl Marx up and read on it. I am extremely interested. Especially since Obama seemed to like him. 
the rest is complicated, but economists are genteelly stuck between the ideas of Marx, and Adam Smith.