Have you heard of wage slavery, where people use the term to focus on similarities between slavery and wage like owning and renting a person
I have.  But I do not know a lot about it.  Can you explain?
People generally use it when referring to situations where a person's well being depends on wagers or salary, maybe like someone who lives pay check to pay check
So it is basically when the employees have all of the control and the little guys (employees) are at their mercy
Yes, it has been going on for a long time, there are a lot of the similarities between wage labor and slavery as early as Cicero in Ancient Rome! 
Cicero was one of the people against Julius Ceaser right?
Cicero
Marcus Tullius Cicero (; ; 106 BC – 7 December 43 BC) was a Roman statesman, orator, lawyer and philosopher, who served as consul in the year 63 BC. He came from a wealthy municipal family of the Roman equestrian order, and is considered one of Rome's greatest orators and prose stylists.
His influence on the Latin language was so immense that the subsequent history of prose, not only in Latin but in European languages up to the 19th century, was said to be
thing in the world. Most people exist, that is all".
Within anarchism, the concept of wage slavery refers to a situation perceived as quasi-voluntary slavery, where a person's livelihood depends on wages, especially when the dependence is total and immediate. It is a negatively connoted term used to draw an analogy between slavery and wage labor by focusing on similarities between owning and renting a person. The term "wage slavery" has been used to criticize economic exploitation and social stratification, with the former seen