Slawick twice refereed the French Cup Final (in 1921 and 1925), but is perhaps most well known for being the referee at the 1924 Olympic Football final between Switzerland and the eventual winners Uruguay.
Slawick was responsible for refereeing the French Cup Final twice (in 1921 and 1925), but is most recognized for his role as the referee at the 1924 Olympic Football final, where he officiated a match between Switzerland and Uruguay, which ultimately resulted in Uruguay's victory.