Both Uses

accomplice
in
The Bad Beginning
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Her heart pounding, Violet stood stock-still, wondering if Count Olaf or one of his accomplices would come and investigate.†
p. 102.6 *

accomplices = people who assisted each other in a task
The Baudelaire youngsters looked around and saw that not only had Count Olaf vanished, but his accomplices—the wart-faced man, the hook-handed man, the bald man with the long nose, the enormous person who looked like neither a man nor a woman, and the two white-faced women—had vanished along with him.†
p. 139.1

Definitions:

(1) (accomplice)
a person who joins with another in carrying out a plan -- especially an unethical or illegal plan
(2) (meaning too rare to warrant focus)