In June 1968, the student and workers protests in Uruguay have intensified, and the authoritarian government of Jorge Pacheco also intensifies the repression, to levels never seen before in the so-called "Switzerland of America." In August, Líber Arce, a student at the Escuela de Prótesis Dental and a member of the Communist Youth Union, was wounded. When he died two days later, he became the first student martyr in Uruguay. This biography covers his life, from his childhood in a working-class and humble neighborhood of Montevideo, through his participation in the main student struggles in Uruguay throughout the 1960s, his stay for several months in the USSR, where he studied at the Escuela Superior del Komsomol, until the tragic end of August 14, 1968. His funeral was one of the largest gatherings in the history of the South American country. This biography is also a review of some of the main milestones of the social and political evolution of the Uruguayan left in the 1960s, which help to understand the formation of the Frente Amplio in 1971, a unique experience in the world of unity of the left.