"Power corrupts and absolute power corrupts absolutely." I both agree and disagree with this quote. Human nature is weak and we all prefer the easiest path. Power gives much more temptations than lack of power, but leaders are people after all and we all make mistakes. Some of us are able to resist temptations and some fail at it. In the end, it all depends on the person's character.
As a leader, you have a choice about whether you abuse or use the power you have. We can find a lot of examples for power's corruption nowadays, and one of the most important ones in my opinion is abusive bosses. Most of the managers or supervisors who have control and influence over other employees are not using their power positively. Some bosses scream, others threaten and unfortunately you can't really do anything about it when you're 'powerless'. Another example is a cop who carries a gun. He can arrest people for the silliest things and he does that because he has the authority and because he can. Even though the power they are given is little, they still abuse it and benefit from it.