GS stands for Gioventu' Studentesca, and italian name that can be roughly translated as "Young Students"
GS was born in the United States about 5 years ago thanks to Chris Bacich's presence as a teacher in Xaverian High School (Brooklyn, NY). Chris started inviting some of his young students to hang around with him, go on hikes, trips and vacations.
As the friendship between him and those kids grew deeper, more and more kids started to join this new experience.