https://en.wikipedia.org/wiki/Conk

“The conk (derived from congolene, a hair straightener gel made from lye) was a hairstyle popular among African-American men from the 1920s to the 1960s.^[1] This hairstyle called for a man with naturally “kinky” hair to have it chemically straightened using a relaxer (sometimes the pure corrosive chemical lye)”

https://en.wikipedia.org/wiki/Zoot_suit

Zoot Suit Riot in 1943 because zoot suits were considered unpatriotic https://en.wikipedia.org/wiki/Zoot_Suit_Riots