Mobsters I resolved to reform (9)

I believe the answer is:

evildoers

I'm a little stuck... Click here to teach me more about this clue!

'mobsters' is the definition.
The definition and answer can be both people as well as being plural nouns.
Maybe there's an association between them I don't understand?

'i resolved to reform' is the wordplay.
'to reform' is an anagram indicator (letters in a new form).
'i'+'resolved'='iresolved'
'iresolved' anagrammed gives 'EVILDOERS'.

Can you help me to learn more?

(Another definition for evildoers that I've seen is " People acting wickedly".)

I've seen this clue in the Sydney Morning Herald.

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