While I was looking for the photos shown in The Real Bobby Fischer? I found the following photo. The eBay description said,
This is an authentic vintage photograph that shows chess players who participated in the 1966 Chess Olympiad in Havana, Cuba. The photo was taken at the Havana Hilton Hotel in which the Olympiad was held.
I'm not sure if it's been published before.
Front row, left to right: (USSR) Stein, Korchnoi, Polugaevsky, Spassky, Petrosian, Bondarevsky, (USA) D.Byrne, R.Byrne, Benko, Rossolimo, Fischer
The USSR and the USA finished first and second overall. For more about the event, see 17th Chess Olympiad: Havana 1966 (olimpbase.org).