The Brown Dog Affair was a series of demonstrations and riots surrounding a statue that had been erected in the Battersea area of London, commemorating dogs who had been killed due to vivisection.
Research:

Percy Fawcett, Manuscript 512, and a Lost City in the Amazon, Pt. 1
34:05

SYMHC Classics: Swill Milk
39:22

Behind the Scenes Minis: Mary, Beulah, Baby Alive
33:26