'Workmen' in the Bible

then said he unto them, 'The harvest indeed is abundant, but the workmen few; beseech ye then the Lord of the harvest, that He may put forth workmen to His harvest.

And at the right time he sent a servant to the workers to get part of the fruit from the vines; but the workmen gave him blows and sent him away with nothing.

But when the workmen saw him, they said to one another, This is he who will one day be the owner of the property: let us put him to death and the heritage will be ours.

And driving him out of the garden they put him to death. Now what will the lord do to these workmen?