All 8 Uses

collaborate
in
The Spy Who Came In From The Cold
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One thing puzzled him: Peters' insistence that Karl Riemeck must have had help—must have had a highlevel collaborator.†
Chpt 8
That would mean that Karl Riemeck had collaborated with this special interest and provided what both of them had together obtained.†
Chpt 8

collaborated = worked together
Of course—here was a point, here was a possible explanation—Elvira, knowing the identity of Riemeck's special collaborator, had been murdered by that collaborator......No, that was too farfetched.†
Chpt 8
Of course—here was a point, here was a possible explanation—Elvira, knowing the identity of Riemeck's special collaborator, had been murdered by that collaborator......No, that was too farfetched.†
Chpt 8
We cannot yet prove that Mundt's success in liquidating minor Western intelligence agents was the work of his imperialist masters betraying their own collaborators—those who were expendable—in order that Mundt's prestige should be enhanced.†
Chpt 20
In late 1960 a former collaborator of ours approached an Englishman in the Lebanon known to be in contact with their Intelligence Service.†
Chpt 20
From mid-1960 onwards we were losing collaborators abroad at an alarming rate.†
Chpt 20
The People's Prosecutor, in collaboration with Comrade Mundt, will no doubt consider what action is to be taken against...
Chpt 23 *

collaboration = the act of working together

Definitions:

(1) (collaborate)
work together on a common enterprise or project

or more rarely and especially in the form collaborator: cooperate with the enemy as a traitor
(2) (meaning too rare to warrant focus)