Two people and two institutions that have power over you.

People - 

1) My doctor has power over me. My health is in her hands. She recommends and approves medications, fills out important documents for me, orders me to get x-rays, and instructs me on what to eat in order to put on more weight. 

2) My college professors had power over me. They decided what textbooks I had to read, what formats I had to use when writing papers, what schedule to follow, and what grading system was used in figuring out my final scores. 

Institutions - 

1) The federal, state, and local governments have power over me because they decide what rules I have to follow. 

2) The Highway and Transportation Commission has power over me because they determine the construction and location of highways and roads, and they carry out laws and regulations related to transportation.