Controversial workers beginning to share taxis (5)

I believe the answer is:

scabs

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'controversial workers' is the definition.
'scabs' can be an answer for 'workers' (scab is a kind of worker). I am unsure of the 'controversial' bit.

'beginning to share taxis' is the wordplay.
'beginning to' indicates taking the first letters.
'taxis' becomes 'cabs' ('cab' can be a synonym of 'taxi').
The initial letter of 'share' is 's'.
's'+'cabs'='SCABS'

Can you help me to learn more?

(Other definitions for scabs that I've seen before include "They continue to work" , "Blacklegs, strikebreakers" , "Wound crusts" .)

I've seen this clue in The Independent.

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