Biography
At least 2 bands are known with the name Pacto de Sangre, one from Spain and one from Puerto Rico.
1) Pacto de Sangre is a hardcore band formed in 2007, in Jerez, Spain. They are curently signed to Laotraopción records and belong to LaXOtraXOpcionXCrew, a loose collective of musicians and friends from the hardcore/punk Andalusian scene.
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2) A christian heavy/power metal band from Puerto Rico. So far they have only released one full length album entitled Alerta, released on 2003 through Khaosmaster Productions.
Biography text from Last.fm, available under CC BY-SA.