Why is a death sentence decreed upon Frederick?

In chapter
eight,declares that Mr. Frederick must die because he cheated him while purchasing timber. The
five pound notes with which Mr. Frederick had paid Napoleon for the timber were later proved to
be forged, meaning that Mr. Frederick had taken the timber for free. Napoleon states that if
captured, Mr. Frederick will be boiled alive.

Over and above the financial
loss, this was a humiliation to Napoleon, who had proudly displayed the notes for all the
animals to see.

The following day, Frederick and his men arrive atwith guns,
and force the animals into the farm buildings. He then blows up the windmill, which the animals
had spent the last year rebuilding. Filled with rage, the animals attacked Mr. Frederick and his
men. Many of the animals ended up being killed or injured. Frederick and his men are also
injured in the attack, and leave Animal Farm.