  Spin-orbitronics and Dirac quasiparticles are two fields of condensed matter
physics initiated independently about a decade ago. Here we predict that Dirac
quasiparticles can be controlled by the spin-orbit torque reorientation of the
N\'{e}el vector in an antiferromagnet. Using CuMnAs as an example, we formulate
symmetry criteria allowing for the co-existence of Dirac quasiparticles and
N\'{e}el spin-orbit torques. We identify the non-symmorphic crystal symmetry
protection of Dirac band crossings whose on and off switching is mediated by
the N\'{e}el vector reorientation. We predict that this concept, verified by
minimal model and density functional calculations in the CuMnAs semimetal
antiferromagnet, can lead to a topological metal-insulator transition driven by
the N\'{e}el vector and to the corresponding topological anisotropic
magnetoresistance.
