  Grand Unified Theories (GUT) offer an elegant and unified description of
electromagnetic, weak and strong interactions at high energy scales. A
phenomenological and exciting possibility to grasp GUT is to search for TeV
scale observables arising from Abelian groups embedded in GUT constructions.
That said, we use dilepton data (ee and $\mu\mu$) that has been proven to be a
golden channel for a wide variety of new phenomena expected in theories beyond
the Standard Model to probe GUT-inspired models. Since heavy dilepton
resonances feature high signal selection efficiencies and relatively
well-understood backgrounds, stringent and reliable bounds can be placed on the
mass of the $Z^{\prime}$ gauge boson arising in such theories. In this work, we
obtain 95\% C.L. limits on the $Z^{\prime}$ mass for several GUT-models using
current and future proton-proton colliders with $\sqrt{s}= 13~{\rm TeV},\,
33~{\rm TeV},\,{\rm and}\, 100$~TeV, and put them into perspective with dark
matter searches in light of the next generation of direct detection
experiments.
