  The interplay between charge order (CO) and nontrivial band topology has
spurred tremendous interest in understanding topological excitations beyond the
single-particle description. In a quasi-one-dimensional nonsymmorphic crystal
TaTe$_4$, the (2a$\times$2b$\times$3c) charge ordered ground state drives the
system into a space group where the symmetry indicator features the emergence
of Dirac fermions and unconventional double Dirac fermions. Using
angle-resolved photoemission spectroscopy and first-principles calculations, we
provide evidence of the CO induced Dirac fermion-related bands near the Fermi
level. Furthermore, the band folding at the Fermi level is compatible with the
new periodicity dictated by the CO, indicating that the electrons near the
Fermi level follow the crystalline symmetries needed to host double Dirac
fermions in this system.
