A prominent 9/11 memorial organization is teeing off on the PGA's decision to join forces with the Saudi-backed LIV Golf tour ... saying the move is nothing but an act of betrayal.
9/11 Families United -- a group of thousands of family members whose loved ones were killed or impacted during the September 11, 2001 terrorist attacks -- tells TMZ Sports it is "shocked and deeply offended" by Tuesday's news of the PGA/LIV merger.
"PGA Commissioner Jay Monahan co-opted the 9/11 community last year in the PGA's unequivocal agreement that the Saudi LIV project was nothing more than sportswashing of Saudi Arabia's reputation," chairman Terry Strada, whose husband died in the World Trade Center's North Tower, said in a statement.