Tributes paid to organised labour (5,4)

I believe the answer is:

union dues

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'tributes paid' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'organised labour' is the wordplay.
'organised' becomes 'union' (similar in meaning).
'labour' becomes 'dues' (I can't justify this - if you can you should believe this answer much more).
'union'+'dues'='UNION DUES'

'to' is the link.

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I've seen this clue in The Globe and Mail and The Guardian.

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