these are the three internships that I found, all of the alumni that mentioned that the internships was the most valuable things they ever did makes total sense and especially with something like design, you get to experience the outside world, the real world which being outside of the school environment, talking with new people, doing it because you want to not because its homework i believe brings you more ideas, and makes everything in a much more creative way. I believe that it is crucial to be in an internship before job because then you see if that is exactly what you like or what you would change before actually getting into your job and then theres no way back other than quitting. it kind of gets your feet wet.
https://www.barefootstudent.com/austin/jobs/internships/graphic_design_internship_1920297043
http://www.internships.com/social-media/social-media-content-graphic-design-intern-i4730047