MURDEROUS GANGSTERS, March 1952 -- Vol. 1, No. 3. Published quarterly by REALISTIC COMICS, INC., 575 Madison Ave., New York 22, N.Y. Index revised based on a scan from http://goldenagecomics.co.uk/.
On inside front cover. Preview of the issue's stories.
Tony's last name is also given as Sango and Fango in the intro. Art identification from Gary Watson, June 2009. In GCD Error Report 12055, Christoph Melchert notes that the script for "Blabbermouth" in Crime and Punishment (Lev Gleason, 1948 series) #70 (December 1954) is identical to this story.
Cold-Blooded Killer is in lower case in the title.