During his final years he started at the Woolworth Bldg and couldn't pay the rent and moved from place to place owing considerable sums of money. He wound up at the Hotel New Yorker and died there in debt.

Probably the only reason the FBI took his things is because of his claims about a "Death Ray" and some other "Military" applications. Trump reviewed everything and said it was harmless stuff. Tesla's nephew Sava Kosanović shipped everything to Belgrade where the Museum is. The idea his inventions were salted away by the Govt borders on conspiracy theories. If his secret inventions were so great they would have been perfected over the years and they haven't. As I recall one invention was used in Auto Speedometers years after his death.

Morgan refused to finance his "Free Electricity" because it was a bogus concept and would never work plus Morgan was dead and his family was calling the shots.

I'm not saying Tesla wasn't a genius. He certainly was and was a rare individual however he was very eccentric bordering on crazy. Many of his inventions were impractical and just wouldn't work. He had a gripe with Physics and wouldn't accept the existence of the atom. He sued many over "his" inventions like Marconi and lost every lawsuit.

His main interest at the end was talking to Pigeons like they were people.