Maryland Steel was started in 1887 and began building ships in 1891.  It was bought by Bethlehem Steel in 1916 and was a major merchant shipbuilder in WWI and between the wars, fully operational at the beginning of the WWII emergency.  It continued to build tankers and dry bulk carriers for private-sector customers throughout the war.  It carried on as a merchant shipbuilder after the war but abandoned new construction in 1986.  It continued in the ship repair business, moving a large floating dock from its Key Highway yard to Sparrows Point for this purpose.  Uncompetitive in the repair business because of its high cost structure, Bethlehem sold the shipyard to Veritas Capital in 1997, which renamed it Baltimore Marine Industries.  BMI was not successful, however, filed under Chapter 11 in June 2003 and was liquidated in November 2003.  The yard was then bought by a nitwit from Boston, who used the big graving dock to scrap ships for MARAD, but inevitably defaulted.  It is now idle.  See it from the air on Google here.