CGT, Unionism isn't voluntary. In many cases is imposed by violence and intimidation that you would normally associate with the mafia.
Imagine keeping your job on the wharfs or a Perth CBD building site if you didn't pay up. Ever seen a ?ard show day'? How do you suggest 100% closed shops are maintained, by discussion groups and poetry?
Have a read about the recent case of a chap called Cranford who wanted to leave the CFMEU but still be employed by BHP at the Norwich Park coal mine.
The ALP is funded through a network of violent thugs.
