Consigliori means advisor and that person is the right hand of The Don in italian Mafia-families.
From The Godfather:
The other Mafia families disliked the fact that the Corleones had a german-irish Consigliori. Because of Tom Hagen, the Corleones were sometimes referred to as "The Irish Gang".
A weapon originally used by Sicilian wolf-hunters, but now is a popular gun used by the Mafia
Michael Corleone felt safe walking with the two shepherds, and they did not try to hide their luparas to the public.
A highly ranked person in the italian/sicilian mafia. A regime is a troop, and a capo is a leader/boss.
In The Godfather, Don Vito Corleone and Consigliori
Tom Hagen is the highest, and after them comes the family's two caporegimes, Clemenza and Tessio. Later, Rocco Lampone creates a new regime.
Sonny Corleone: "Our two New York-regimes are more than a thousand men, that's more than the other five NY-mafia-families have together."
Six people were present at the meeting in Don's working-room: Michael, Sonny and Don, Tom Hagen, and the caporegimes Clemenza and Tessio.