A ban from the 60s refused entry to hippies, it fell out of use and was removed from the books early in the 1990s.
At no point in time were Led Zeppelin, the Bee Gees, Cliff Richard, Kitarō or other long haired men transiting Singapore during that period (1960-1990) executed.
Like the USofA, freedom in Singapore is f(wealth).
Legally, justice wise, it's still rooted in English common law from it's time as a colony prior to the British getting over run by Japanese on bicycles.
Even its class bigotry is rooted in colonial British attitudes.
At no point in time were Led Zeppelin, the Bee Gees, Cliff Richard, Kitarō or other long haired men transiting Singapore during that period (1960-1990) executed.