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The BRST quartet mechanism is briefly reviewed. A special emphasis is givento the distinction of perturbative versus non-perturbative quartets. The fieldcontents of the non-perturbative BRST quartets generated by transverse gluonsor quarks in Landau gauge are presented. Corresponding truncated Bethe-Salpeterequations for the respective first daughter and second parent states arederived. It is discussed in which sense these equations provide evidence forthe existence of bound states as daughter states in non-perturbative BRSTquartets. It is noted that within the scaling solution of functional approachesthe infrared divergence of the quark-gluon vertex is exactly the right onetomake the respective Bethe-Salpeter equation infrared consistent.

The non-perturbative BRST quartets generated by transverse gluons or quarks in Landau gauge