Fannie Mae-No Politics (FNMA)

[Sogo]

And once 2 classes of shares exist, with one new class of newly issued shares diluting the previously existing commons, the two types will become co-mingled. And then I think any judge would be hesitant to attempt to try to re-separate the old and new shares.
That problem could be avoided if the new shares are actually delineated as a new "class", similar to, say Google's two classes of shares. But I doubt any new shares would be issued as a separate class like that.