Crimos were a type of specialist soldier used by the Federation. "Crimo" is stated by Blake to be a portmanteau of "criminal psychopath". Their chief onscreen role was to assist Travis in his gambit in the Communications Tower on Exbar, in place of his usual crew of Mutoids, who were unavailable to him as a fugitive. It is therefore possible that Crimos were really mercenaries, unable to be enlist in the standard Federation military because of their unstable tendencies.