Macbeth is shown murdering King Duncan in his sleep. We see the dagger cut into his neck, but the scene cuts away before Macbeth slits it open. Later, we briefly see a pool of blood dripping from the bed onto the floor.
Macbeth is shown murdering Duncan's two chamberlains. The first we briefly see Macbeth cut his throat (not seen long) The second Macbeth stabs through the chest and kicks him down the stairs. Somewhat bloody but obscured in detail due to the black and white cinematography.
Macbeth sends murderers to kill Banquo. The murderers are shown knocking Banquo off his horse, followed by a sword fight between them. Eventually, one murderer stabs Banquo through the chest, and another murderer slits his throat but the camera edit does not show the wound or any strong bloody detail.
We briefly see Banquo's ghost come to haunt Macbeth as a bloody corpse.
A group of murderers come to murder MacDuff's family, but very little is shown. A man grabs a little boy and throws him off the castle wall, but he falls into a fog and we don't see anything graphic or violent. It is later reported that the whole family was murdered.