"which perpetuate the control of the educated and wealthy few, over the uneducated and working many -- & are most repulsive to us, are most agreeable to them"
This was written by a pure Abolitionist. They hated the U.S. Constitution and the tip off is the word "which perpetuate", meaning- continues the law of the U.S. Constitution and "are most repulsive to us", meaning Abolitionist.