People who attack the workers (10)

I believe the answer is:

assailants

'people' is the definition.
(assailant is a kind of person)

'attack the workers' is the wordplay.
'attack' becomes 'assail' ('assail' can be a synonym of 'attack').
'the workers' becomes 'ants' (I've seen this before).
'assail'+'ants'='ASSAILANTS'

'who' is the link.

I've seen this clue in The Telegraph.

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