Why was ALLAN MELVIN the most recognized face in HOLLYWOOD during the 1960's and 1970's?

A look into the life and acting career of one of the BEST character actors of all time, Allan Melvin! Why his face was always present for 3 decades!

allan melvin,the andy griffith show,my favorite martian,the phil silvers show,gomer pyle usmc,sam the butcher,the brady bunch,barney hefner,all in the family,archie bunkers place,fred plumber,al the plumber,liquid-plumr,magilla gorilla,