Last month, a press leak revealed that Google has been working with the U.S. Department of Defense on a drone program called "Project Maven," which is being developed to scan images in drone footage and identify targets.

Prior to it being reported in the news, this project was unknown to most Google employees, even those who were working on different aspects of the project.

The company was so secretive about the project and kept their employees so compartmentalized, that thousands of talented engineers had no clue that they were aiding a war effort. Now, many of those employees are speaking out, and demanding that the company cancel its work on the controversial program.

This week, a letter that was signed by over 3,100 Google employees, addressed to Google CEO Sundar Pichai, stated that they did not want to be involved "in the business of war."