"become top heavy with management"

I worked on a floor with approx 100 people.

After the 'reorganization' we had the same number of people, the same amount of work. The top level manager, now of course had to be increased a grade, because he now had more people at higher levels to manage ....

Now we had grades that included "Class 4" and "Class 2/3" (a previous public service wide 'reorganization combined these 2 levels) the 'bottom grade'.

The number of Class 4s doubled (the number of Class 5s etc increased as there were now more Class 4s to 'manage', etc). Each Class 4 now supervised only 2 Class 2/3s - of which there were now fewer, of course. These now new "management positions" were considered to be also 'doing the sort of work that the 2/3s were previously doing, but more efficiently' !!! ... but all the extra 'supervising work' though, meant that the Class 4s actually had less time to do the actual grunt work ...

"I wonder where the money goes" ...