Robert Shaw in Jaws Or Val Kilmer in Tombstone Both are often considered robbed of not getting Best Supporting Actor. They weren't even NOMINATED, which is the real crime. I'd say Shaw is the bigger robbery though. Shaw in Jaws is honestly one of the best acting performances of all time.
The 70s has a shitload of legendary acting performances. Shaw is easily in the top 5-10 of the performances imo.
I thought the animatronic shark ate his performance alive but that's just me. You sea what I did there?