1) KILLING OSWALD (2013)
Amazon Prime here.
This concise 50 minute documentary looks at the A to Z of Lee Harvey Oswald's life, which was far more unusual than I remembered it. See also Oswald's Wikipedia biography here. Very well done and thought-provoking.
2) JFK (1991; Oliver Stone)
Original version on Amazon Prime rents $3 here.
Director's Cut streams for $13 purchase only.
The original movie was over three hours and the director's cut is three and a half, but I was amazed how fast it moved. Very well done and with an A-list cast. I don't think I'd seen it since 1991.
See the original trailer at YouTube here. See a classic four minute clip with Donald Sutherland here. I recommend seeing the Oswald movie above, or at least, looking at Oswald's Wikipedia page, before teeing up JFK. Easter egg - real-life attorney Jim Garrison, the focus of JFK, plays a cameo as Justice Earl Warren.
3) JFK: A President Betrayed (2013)
Amazon Prime, here,
Narrated by Morgan Freeman, a review of Kennedy's presidency from an international affairs perspective, including his battles with CIA and State Department. 90 minutes.
4) REMASTERED: Tricky Dick and the Man in Black (2018)
Netflix VOD.
I recall seeing a review of this two years ago, and it popped up among other Netflix documentaries. Surprisingly well made and interesting. Notable for its profile of Johnny Cash; Nixon is a supporting figure to the documentary's story. Concise at one hour.
And Honorable Mention to:
#5) MY GENERATION (2018)
Amazon Prime rents $1, here.
A documentary about rapidly evolving arts and culture of the 1960s, narrated by Michael Caine [*]. One twist: It's all documentary footage; many interviews, but only as voiceovers, so we never see the 1960s stars as 80 year olds. 90 minutes.
#6) KING IN THE WILDERNESS (2018)
Amazon Prime rents $4, here. Also an HBO asset.
Very well made and surprisingly absorbing documentary about the last three years of Martin Luther King's life. 1 hr 50 min.
Award winning documentary about the life of author James Baldwin, viewing his life through the lens of a book that would have been his last project. One hour 30 minutes.
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And a bonus (#8), almost twenty years old:
PATH TO WAR (2002)
Amazon Prime rental $4 here. Also an HBO asset.
Incredible 2 hr 45min biodrama about the four years of LBJ's presidency, with a star performance by Michael Gambon, supported by Alec Baldwin as McNamara and by Donald Sutherland. One of my favorite films, period.
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[*] Apparently Michael Caine has three books of memoirs, "What's It All About?," "Blowing the Bloody Doors Off," and "Elephant to Hollywood." I read "Blowing" as a library loan ebook after seeing My Generation.