high treason

noun
treason against the sovereign or state.

Origin:
1350–1400; Middle English

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
high treason
 
n
an act of treason directly affecting a sovereign or state

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
IN short, high treason against this once great nation.
As far as any science is concerned, he committed high treason, and he should be
  dealt with accordingly.
But sport is war by other means, and changing allegiance is sometimes
  considered high treason.
Opposition leaders were accused of hugely inflated crimes, such as high treason
  and genocide.
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