The Australian retail banks have effectively been nationalised. What Ben Chifley tried to do in 1947 but failed has been achieved in 2017. Chifley was a Labor PM. Turnbull is nominally Liberal.

The banks all operate with a government guarantee on deposits. In effect, the Government, ie the taxpayer, has assumed a fundamental risk of the banking business. They operate within a big 4 policy framework that shuts down the possibility of mergers and restricts competition from other parties. The Government is now going to impose an arbitrary tax on the banks outside normal company tax rules. The Government is going to regulate bank executives behaviour, keep a register of ‘acceptable’ vs ‘non-acceptable’ bank staff, control bankers’ pay and the gender make-up of the employees. There are very few aspects of banking business that are not under covert or overt Government control.

This is the path to socialism.