had been assembling
-había estado reuniendo
Past perfect progressiveconjugation ofassemble.There are other translations for this conjugation.

assemble

While the factions had been assembling and conferring, Lenin with his make-up still on, in wig and big spectacles, was sitting in the passage-way in the company of two or three Bolsheviks.
Mientras se reunían y conferenciaban las fracciones, Lenin, todavía disfrazado, con una gran peluca y gruesas gafas, se encontraba en compañía de dos o tres bolcheviques en una sala lateral.
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