The judicial phrase inter sīcāriōs means ‘on the charge of assassination.’ I’m not sure if this is as general use of inter (neither A&G nor L&S seems to say) but if I may title the ‘criminal inter‘ (from crīmen, charge/accusation) preposition, then consider the following possibilities:
inter impudentēs: on the charge of shamelessness
inter cinaedōs: on the charge of sodomy
By any and all means, correct me if I’m crazy or defend me if you think I might be on to something. I realize this is speculation; we only have limited textual data to support a theory on either side—it’s really a matter of personal judgment and extrapolation based on our available resources.
One of the more idiomatic uses of the Latin accusative is a part for whole construction, the synechdochical (συνεκδοχή) accusative, wherein the accusative subject specifies the range of the verb or adjective. This is also called the Greek Accusative, or the Accusative of Specification.
Caput nectentur: they shall be bound at the head.
Nūda genū fuit: she was bare to the knees.
Femur trāgulā ictus vēnit: he arrived wounded in the thigh by a dark.
The vocative macte is a party to a particular Latin idiom that you may encounter. Macte is the imperative of the Latin second declension adjective mactus (blessed, honored, cf. Greek μακάριος).
The idiom runs like this:
Macte (estō) (virtūte): success attend your honor!
Now, the ‘standard’ rendering offered by A&G (^^^) is a little too translationese, in my view. Something like, ‘be blessed in honor’ would more closely attend to the syntax of each word.
Further, realize that both estō and virtūte are optional, but at least one of the two must be present (macte estō virtūte, macte estō, macte virtūte).
With just macte! we have a different idiom all together (blessed! — something like the English ‘fantastic’ or ‘awesome’ or ‘that’s great.’)
Finally, we should echo A&G’s hesitation about the fact that the quantity of the final -e in macte is indiscernible given the extant verse poetry that contains this idiom, and therefore it might actually be mactē, an adverb. It is a matter of scholarly dispute.