This was given a lot of money because John Frankenheimer was "hot" and the novel was a big deal in its day. Its day has passed.
This starts off lively with a good old progrom in 1910s Russia then becomes bogged down as handyman Alan Bates goes to work for Hugh Griffith whose daughter Elizabeth Hartman is horny for him - this is a basic stock situation but takes around 40 minutes to get us there.
At heart this is a television play - a man is falsely accused of a crime he didn't commit, because he's Jewish. There's some fancy production values at the beginning but the guts of this takes place in prisoin cells and interrogation room.
Fine acting from Bates, Dirk Bogarde (tortured official), Ian Holm (prick), David Warner (aristocrat), Carol White (ex wife). It has views of sixties in that women are bitches - Hartman fakes a rape claim, White is a harlot. The characters say the word "Jew" in dialogue a lot.
It's not dumb, it tries to be decent, it has some moments but it's a slog. Kind of like Birdman of Alcatraz.
I think it needed a plot witith someone on the outside.