In case your wondering what Glass Steagall is in the first place, this vid provides a simple and sufficient answer to that question.
In a nutshell Glass Steagall is the shorthand name for legislation passed in 1933 that was specifically designed to help prevent another stock market crash ala 1929 and subsequent depression ala "The Great Depression".
It worked like a charm too ...... right up until the moment it was repealed.
Democrats are gonna hate this story as it totally blows up the notion that the powers that be within the Democrat party care one whit more about you than do those reprehensible fascists of the right.
If you take the time to watch this, you'll at least have an understanding of what hit you.