The mafia conspiracy on RFK would be the same as for JFK. He was relentless going after them and the teamsters. He had been out of power since they killed JFK. Now he looked like the lead for president. Something they couldn’t survive. Also, they were in bed with the teamster retirement fund.
I agree with your idea that if the mob killed JFK, it would have to kill RFK. Have you ever heard a plausible conspiracy theory implicating the mob in RFK's assassination? Mob involvement in JFK's assassination has some plausibility but I have never heard of any plausible evidence of mob involvement in RFK's assassination.
To me that has always been the biggest problem with the idea of mob involvement in the JFK assassination.
During the presidential election in 1960, a few thousand voters crawled out of their graves to do so. There had been a meeting of both Joe and John Kennedy with Giancana at separate times asking for Giancana’s support through the mafia and the unions for West Virginia. Giancana was the Chicago mob boss at that time and also assisted in Illinois. A lot of this was brokered by Frank Sinatra who was a good friend of both.
The deal, if I understand it, was if John won the election, he would order RFK, who would be assigned to the AG slot, to leave Giancana alone. They didn’t, so Sam took care of both.
http://channel.nationalgeographic.com/killing-kennedy/articles/jfks-secret-mafia-history/
http://www.cosmosclub.org/journals/1996/goldfarb.html
A respected J. Edgar Hoover biography revealed that FBI bugs uncovered the fact that Frank Sinatra had asked Sam Giancana for help with the Kennedy campaign in Illinois in the 1960 election and the organized-crime figure had provided it. Giancana had also raised money for JFK’s crucial West Virginia primary campaign at the request of Joseph Kennedy...and later felt he was “not getting his money’s worth.” Giancana later cursed John Kennedy, complaining, “We broke our balls for him and gave him the election and he gets his brother to hound us to death.”
I guess you dance, you pay he piper.
rwood