As the 20th century progressed, Jewish-American mobsters such as "Dopey" Benny Fein and Joe "The Greaser" Rosenzweig entered labor racketeering, hiring out to both businesses and labor unions as strong-arm men. Labor racketeering or "labor slugging" as it was known, would become a source of conflict as it came under the domination of several racketeers including former Five Points Gang members Nathan "Kid Dropper" Kaplan and Johnny Spanish during the Labor slugger wars until its eventual takeover by Jacob "Gurrah" Shapiro in 1927. Other Jewish organized crime figures involved in controlling labor unions include Moses Annenberg and Arnold Rothstein, the latter reportedly responsible for fixing the 1919 World Series.[1][page needed]