WHAT IS DICYANIN & WHY IS IT ILLEGAL

MOVIE- TheyLive 1984 : Nada, a wanderer without meaning in his life, discovers a pair of sunglasses capable of showing the world the way it truly is. American science fiction action horror film written and directed by John Carpenter, based on the 1963 short story "Eight O'Clock in the Morning" by Ray Nelson in 1963
https://sflix.se/watch-movie/watch-they-live-hd-16655.5302594

Eight O'clock In The Morning: https://archive.org/details/eight-oclock-in-the-morning/mode/2up

Eight O'clock in the morning - Ray Nelson 1963 [Video Same as link above]
https://www.youtube.com/watch?v=0S-QSuNEn0M