The Chin.
Q. (Staying with Gotti): Why was his close pal Angelo Ruggiero called "Quack-Quack"?

He talked a wee bit too much, known for being a bit of a blabbermouth.

Easy question. What's the common name for the popular wall street stock scam?

"Pump-and-dump."
Q. Name the Wales-born gangster who ran labor rackets for the Chicago Outfit into the Seventies.

Damn it Turnbull, lol. WHo knowz??????????????

Tom Jones

Q: WHo was Capone's right hand man?

If I could try to answer Turnbulls question.

Murry " The Camel" Mumphreys?

THANK you, Joe Cago! Your turn to ask a question:

Oops Humphreys not Mumphreys...

Q. What boss had elective surgery for a penile implant?

Excellent moniker Cago, I've almost finished the Valachi Papers and it's been a real good read.

That will Castellano, one of the many reasons embarrassing the Family and maybe even contributing to his downfall.

Q, Who is rumoured to still head the Cupola today whilst apparantly still being in hiding for nearly 50 years?

Bernardo Provenzano.
Q. Where was Al Capone imprisoned on his tax rap before he was transferred to Alcatraz?

Atlanta Federal Pen

How many times was Carlo Gambino arrested?

At least five times: for larceny and for bootlegging before WWII, for masterminding a hijacking that Gotti was also arrested for (in 1969), and at least twice for immigration violations.
Q. Who were Gambino's two underbosses at the time of his death?

A. Its debatable if Gambino had two underbosses at the time of his death. Aniello Dellacoce held the title, replacing Joe Biondo in the mid '60's. My guess for a second underboss (IF there was one) would be Paul Castellano.

Assuming that answer is correct -

Q. Aniello Dellacroce was stepped over (for the second time) when Gambino selected Castellano to succeed his as Boss of the Family. When was the first time Dellacroce was stepped over?

When Gambino succeeded The Mad Hatter in 1957.
Q. Who was The Mad Hatter's predecessor?

Vincent Mangano. Both Vince and Phil, his brother were killed by AA.. Vince's body was never found.
Q. This NYC boss had a hit on Carlo Gambino, and succeded in having his look alike brother acutally shot. Who was he?

Paul Gambino was shot at but lived after Maranzano ordered all the top guys with Masseria to be whacked.

Q, The opening line to Bruce Springsteen's Atlantic City are about a hit on a Wiseguy. Who is it?

"Well they blew up the chicken man in Philly last night, and they blew up his house too...".

Phil (Chicken Man) Testa.
Q. Who was the Chicken Man's predecessor and what was his nickname?

A. Angelo Bruno, "The Gentle Don".

Q. Sticking with the Philly mob, who preceeded Bruno? (Hint: its a little tricky).

A: Nicky Scarfo

Q: staying on philly, who was behind Bruno's killing.

Not so fast.....Scarfo came after Angelo Bruno; the question still stands.

Joseph Ida was Angelo Bruno's predecessor.
Sticking with Atlantic City:
What political boss (not Mob boss) hosted the famous 1929 gangster convention in Atlantic City?

Technically, Bruno's predecessor was Antonio Pollina, who was named by Joseph Ida as the new boss (in 1959). For a short time Pollina, as the boss, plotted against underling Bruno, causing Bruno to visit with Carlo Gambino. Gambino, friendly with Bruno, showed his muscle and named Bruno as the Philly boss. Pollina realized what the situation was and acquiesced. (I said it was a tricky answer).

Turnbull's question still stands.

Thanks for the details, SC.
Since no one has answered in more than 24 hours:
Enoch (Nucky) Johnson, the Democratic boss of Atlantic City, hosted the famous Mob convention there in 1929. Keeping with AC:
Q. What happened to Al Capone after the convention?

Im not positive but wasnt he arrested?

A. He got himself arrested (on purpose) in Pennsylvania.

Q. Staying with the convention, which mobster "honeymooned" there in AC during the convention?

Edit: Oooops, sorry, DP, you got in there ahead of me with your answer while I was typing mine.

Meyer Lansky.
Q. What did the kid Lansky say to the kid Luciano the first time they met that led them to become lifelong friends and allies?

Lansky told him to "fuck off."
Luciano wanted Lanksy to pay protection-money.

Q:This man (kid at the time) was robbing his landlady at the age of 14.

Because nobody answered in (about) 3 days:
The answer is Frank Costello

Q: Dont know one

I'll post one:
Q. Name the gangster who ran gambling ships out of Los Angeles harbor in the Thirties and Forties and earned the nickname "The Admiral"?