If you say the Constituion gives the Federal Behemoth the right to execute anyone (during peacetime) from crimes short of Treason -- show me the clause! I know it's been done -- Timothy McVeigh being an example -- but like much of what the Behemoth does these days, it is well beyond any charter.
What in the world are you talking about? Since when does the Constitution have to explicitly confer a right to execute anyone for crimes short of treason? Does it explicitly confer a right to imprison or fine someone for crimes short of treason or for treason itself for that matter? The Constitution doesn't explicitly permit a particular punishment for any particular crime.