My best guess is a mob hit.
Good Call. "42 Gang", Sam Giancana (Chicago), Hol Killian and Carlos Marcello (New Orleans), Santo Traficante......more marginally. If you manage to locate discussion of the JFK Assassination that seriously explores
Oswald's time in NOLA prior to JFK's murder then you've found a potentially productive discussion of this.
Surprisingly few, and even
SERIOUS explorations of this incorporate focus of Oswald's time in NOLA.
The article linked to below is a better than average one but even it manages to completely leave out The 42 Gang and Giacana's connection to the guys in NOLA.
In my opinion the eventual Hit had to do with more than just The Kennedy Administration's relationship to The Mafia, some Personal Stuff even between Sam Giacana and JFK that involved a female, as crazy as that sounds but IMO that may have been a straw that broke the camel's back, the camel being Giacana who'd worked with CIA to assassinate Castro but that got all messed up and didn't happen...
...lotta possibilities really but your call of Mob Hit IMO is good.
"perfect storm". Of factions for whom JFK's murder could be beneficial.
Managing to use Oswald and then (
and especially) Sirhan Sirhan to later do RFK are the massive flies in the ointment to a conclusion that MAFIA was completely responsible.
Were that the case, MAFIA-orchestrated
ALONE and they managed to pull this off
with these 2 dudes and again, especially Sirhan, the Genius of these accomplishments would be the most amazing Subterfuge ("Covering" of themselves) ever in history.
MAFIA, yeah IMO but "others" as well. US Government Intelligence, perhaps.
Whatever the case it is the strangest situation ever, by a wide margin.
Salvatore "Mooney Sam" Giancana
http://www.myneworleans.com/New-Orl.../The-Kennedy-Assassination-Fifty-Years-Later/