I was trying to find where I saw the info that stated how Lucky saved Frank from the all the other families that invested in The Flamingo.

Along the search, I found these interesting alternate theories from the daughter of a horse's mouth. Tight lipped Lansky.
I actually give some credibility to sons and daughters of famous mobsters that pass on ONLY because, what does the dead mobster care when he is no longer alive?
I always said that nototrious mobsters should ALL right personal memoirs to leave to their family when they pass on....The money to be made would definitely help AND, the current mob can call it all bullsh*t!...Both sides win. Especially us regular mob enthusiasts.

This may have been posted and apologizes if so.

She stated:
–Frank Sinatra cancelled all his engagements and hid out in the basement of a Catholic church (giving the priest $50,000 for the church because he helped him hide out), after hearing that Chicago mob boss Sam Giancana was plotting to kill him. Giancana was upset that Sinatra was becoming too arrogant and carless and was pushing around members of Giancana’s gang. Sinatra called Lansky in tears, saying he would do anything – even playing a million gigs in all of Giancana’s joints – if Lansky would ask him to call off the plot. What Sinatra didn’t know was that Giancana was listening in on the other line and that Lansky quietly hung up the phone just as Giancana was about to burst out laughing.

–Lansky plotted with “Lucky” Luciano to have gangster Vito Genovese assassinate Adolph Hitler and Benito Mussolini. But by then, Mussolini had already been overthrown in Italy and Vito didn’t want to kill Hitler because he was raking in so much money on the black market that he didn’t want the war to end.

–The commonly held story that Bugsy Siegel was assassinated by the mob over money missing from the Flamingo Hotel-Casino in Las Vegas is a lie. Sandi said that according to Luciano’s lawyer, Moses Polakoff, and others close to Luciano and Lansky, Siegel was killed for disrespecting Luciano by telling the Boss of Bosses to “Go fuck yourself” after Luciano gave the cocky Siegel a dressing down for arriving late with bagels to an important meeting to discuss legal strategy to prevent him going to jail for life. She said there was nothing her father could do to save Siegel’s life after that happened.

–Joe DiMaggio tearfully asked Lansky if he could use his influence to reunite the Yankees slugger with his former wife Marilyn Monroe after Monroe’s divorce from playwright Arthur Miller. Lansky had his boys tail Monroe, but couldn’t do anything about Marilyn’s life spiraling out of control after her illicit affairs with John and Bobby Kennedy and her growing dependence on prescription pills.