I just finished this gem this morning too:
Fury (1936)
Spencer Tracy stars in this serious film about justice (and injustice). I was definitely thinking about the 1/6 insurrection when watching it. Great film to watch, but probably only once. Oh, and Spencer Tracy was amazing in it. After watching this film, I was also thinking what it would've been like if James Cagney was the lead, wowza! Also, if you loved 12 Angry Men (1957), you will most likely love this one too.