Frank Costello.
I'll give the answer to the bar where Larry Gallo was garroted: Sahara Lounge. (Probably only SC would have gotten that one because he corrected me earlier when I posted incorrectly that it was the Elegant Lounge.)
Q. Name Larry Gallo's two mobbed-up brothers.

is one of them crazy joe gallo?

Yes, can you name the other one? (Hint: his nickname was "Kid Blast".)

Are Larry and Louie the same guy?

No, and Louie isn't the name I was looking for.

My crystal ball is showing me, "Albert".

Q. We just missed a birthday - What former Gambino bigwig was born March 12, 1945 in Brooklyn, NY? (Hint: he's still alive, but many Gambino wiseguys would like to change that).

A.the rat...SAMMY the BULL.........Q.When Frankie DICICCO got blown up, who was standing next to the car?

wasnt it gotti?

NO ,it was not GOTTI ..rip ;i'll wait to answer because im sure SC or Don Turnball know.btw..the bomb was intended for gotti.

Frank Bellino.
Q. What was the name of Paul Castellano's live-in goumad?

if its what i understand about Goumad i think its Gloria Olarte.
Q. what's Wreak Havoc? sp? (with my personal interest why i ask this Q.)

GoodFella

A. Some scholars think "Mafia" is an abbreviation of a command given by Giuseppe Mazzini, a Nineteenth Century Sicilian revolutionary and probable Mafia guy, to "wreak havoc" across the countryside. I'm not sure that's the answer you're looking for, GF, but if it is:
Q. What well-known poultry magnate did Paul Castellano shake down?

The only poultry magnate I can think of is the Mayor Koch look-alike, Frank Perdue.

If so,

A former baseball player, Mordecai Brown, had a nickname which was adopted by this gangster

Tommy Lucchese.
Q. In what town did Meyer Lansky have his Florida gambling base? (Hint: not Miami.)

Ft. Lauderdale?

No, it was Hallandale.
Q. What Illinois town did Capone dominate when things got too hot for him in Chicago?

I can't answer your question Turnbull, but I thought the earlier question regarding to "Wreck Havoc" was an FBI strategy in relation to hassling Wiseguys within the Castellano clique.

Cicero.

This current Philly mobster's nickname is "Skinny"

Hmm, I thought of Cicero but thought it was IN Chicago and therefore not applicable as the answer. I guess my Illinois geography needs improvement.

Joseph (Skinny Joey) Merlino.
To go the opposite extreme: what immense NYC mobster turned rat, was shot several times, and lived?

Since no one answered in 24 hours: The name was Fat Pete Chiodo.
Q. What mob boss had his son-in-law killed because he beat up the boss's daughter?

Paul castellano. . .
Q. who is Paul Castellano's bodyguard who let the bar owner suck his dick in front of the costumers.

GoodFella

Tommy Bilotti.
Q. Who was the victim, later turned traitor because of that humiliation?

Since no one has answered in so long: It was Joe (Dogs) Ianuzzi.
Q. On what Staten Island, NY, street was Paul Castellano's lavish home, nicknamed "the White House"? (Hint: the street has "death" in its name in German.)

To keep this thread going: Castellano's mansion was on Todt Hill Road.
Q. What was Capone's wife's name?

Mae/May/Mai I dont know how to spell it.
How did Mad Dog Coll die?

Shot dead in a phone booth.
Q. Which gangster planned to kill special prosecutor Thomas E. Dewey, and was himself killed on Charlie Luciano's order?

Dutsch Schultz
Q: Which Genovese-capo was know as "Jimmy Blue Eyes"

Vincent Alo (aka Johnny Ola in GFII).
Q. In what New York State resort town did Meyer Lansky run gambling?

Since no one has replied in two days: Lansky ran gambling in Saratoga Springs, NY.
Q. What was Frank Costello's born name?