What is corroder?

Some articles on corroder:

Clock Tower 3 - Story - Characters - Subordinates
... Corroder (硫酸男, Ryūsan otoko?) Corroder is the second boss encountered in the game in 1963, he is seen blinding an elderly woman and her adult son ... Corroder's real name, John Haigh (ジョン・ヘイグ, Jon Heigu?), as well as his modus operandi of killing his victims, is inspired by the real John Haigh, who was known in ...