Terry Strada didn’t see it coming, and she feels “completely betrayed.”

Already an outspoken critic of LIV Golf, Strada — the leader of a prominent advocacy group representing families of 9/11 victims — hammered the PGA Tour and commissioner Jay Monahan on Tuesday as “hypocrites” and “shills” for going into business with the rogue Saudi-funded league, which she repeatedly categorized as a “sportswashing” venture.

“I am absolutely appalled, and they should be ashamed,” Strada, the national chair of 9/11 Families United, told The Post in a phone interview. “I knew nothing about this until I saw it in the news this morning. It’s extremely disappointing and appalling that Monahan would stand with us in the media against this sportswashing entity of LIV Golf for a full year and then do this abrupt about-face and not be man enough to even have a conversation and give us a warning or an explanation of why and how they came to this decision.

“He took the coward’s way out, and it’s just disgusting.”

Strada earlier had said in a statement that her organization was “shocked and deeply offended” by the announcement of the new alignment, which also will include the DP World Tour. Strada’s husband, Tom, a partner at Cantor Fitzgerald, died in the North Tower of the World Trade Center during the terrorist attacks of Sept. 11, 2001.

“Mr. Monahan talked last summer about knowing people who lost loved ones on 9/11, then wondered aloud on national television whether LIV Golfers ever had to apologize for being a member of the PGA Tour. They do now — as does he,” Strada said in the statement. “PGA Tour leaders should be ashamed of their hypocrisy and greed.

“Our entire 9/11 community has been betrayed by Commissioner Monahan and the PGA as it appears their concern for our loved ones was merely window-dressing in their quest for money — it was never to honor the great game of golf.”

In an interview with The Post last year, ahead of a LIV event at Trump National Golf Club Bedminster (N.J.), Strada said that LIV Golf was an example of “blatant sportswashing” and “nothing more than a public relations stunt for Crown Prince Mohammed bin Salman Al Saud in an effort to try to erase the gruesome history that his country has with the 9/11 community.”

Strada added in her statement that Monahan previously had “co-opted the 9/11 community” by publicly agreeing that LIV Golf was engaged in sportswashing, but now “the PGA and Monahan appear to have become just more paid Saudi shills, taking billions of dollars to cleanse the Saudi reputation so that Americans and the world will forget how the Kingdom spent their billions of dollars before 9/11 to fund terrorism, spread their vitriolic hatred of Americans, and finance al Qaeda and the murder of our loved ones.”

Strada also noted in Tuesday’s interview with The Post that Monahan and the PGA also “have turned their backs on all of the players that stood beside them and stood up for what is right” — such as Tiger Woods, Rory McIlroy, Jon Rahm and Collin Morikawa — after high-profile golfers such as Phil Mickelson, Brooks Koepka, Bryson DeChambeau, Dustin Johnson and many others defected to LIV Golf.

“How disgusting is that, that you don’t even treat these players who stood by you with any dignity?” Strada said. “You have all these players who took the moral high ground and said they were going to stay with the PGA and support the PGA, because we do not agree with LIV Golf and the sportswashing entity of the Kingdom of Saudi Arabia and that regime,

“They wanted to put their foot down, and Jay just sold everyone out — the 9/11 community, his players, his fans. The PGA is dead as we know it. It’s gone. They didn’t have to do this, but they caved for the money, and it’s just shameful. It’s an incredibly sad day to have the PGA completely turn its back on us and do a complete 180, and destroy the game of golf as we knew it.”