Owen J. Roberts, American Surety Company of New York v…
“ The action of the Union's officials has placed the question of probable prejudice due to the adoption of one of the two alternatives presented wholly in the realm of conjecture, and respondent now seeks to cast upon petitioner the burden of proving the consequences of an event which never in fact occurred.The cases relied on by respondent have to do with an alteration of the terms of a principal obligation prior to any breach, and without the surety's consent. They address themselves to the question whether such a change discharges the indemnitor from liability consequent upon a breach. ”
