What is the list on the institutes computer?

So i have been to the institute and i accessed the terminal. I found a list of names and professions. Among them was Lucas Sims (who i thought was the mayor of megaton in fallout 3), the merchant who goes around selling armor ( i forgot his name but i thought he worked for Stockton), and trashcan Carla. What does this list mean? Are those people working for the institute? I tried killing Carla but she isn't a synth.

That is a list of people who the Institute has been using as informants. They are not synths, they are like Kellogg, who do the Institute's bidding in exchange for money.

I always thought it was suspicious that Carla would stand in your settlement for hours and hours... turns out she was a spy.