This is the 10027th most frequent Russian word.
архивникам
The word "архивникам" is not a standard Russian word. It seems to be a form of "архивник," which can mean "archivist" or "archive worker," depending on context.
Here, 'архивникам' refers to personnel working in an archive, used in the dative case to express 'needed by them'.
Архивникам понадобилась помощь в классификации документов.
The archive workers needed help in classifying the documents.
Here, 'архивникам' denotes the recipients of awards, used in the dative case for indicating the indirect object of the verb.
Награды были вручены архивникам за их упорную работу.
Awards were presented to the archive workers for their hard work.
In this sentence, 'архивникам' signifies the individuals being thanked, dative case denotes the object of gratitude.