Several creators of the successful NBC comedy “30 Rock” have spoken out about working with Alec Baldwin, including one incident in which he reportedly threatened to harm a director.

“30 Rock,” an Emmy-winning comedy series, following the lives of the writers and actors behind an NBC sketch program based on “Saturday Night Live.” Baldwin played Jack Donaghy, General Electric’s vice president of East Coast television programming and microwave ovens, on the show for seven seasons. According to “The 30 Rock Book: Inside the Iconic Show, from Blerg to EGOT,” a new book by Mike Roe, Baldwin wasn’t as much fun off-camera as he was on it.

In Mike Roe’s new book, Doug Abel, a show editor, makes the assertion.

“According to [editor Doug] Abel, Alec turned to [Bernstein] and said that if he did that one more time, he was going to assault him. And he didn’t say it with a smile on his face,” writes Mike Roe.

According to the book, Baldwin was enraged at Bernstein for using his thumbs to frame a shot with his hands.

Bernstein, who went on to have a successful career on programs like “Breaking Bad” and “Fargo,” departed the show after only six episodes, which many believe was due to his dislike for Baldwin.

Baldwin earned two Emmys and three Golden Globe Awards for his depiction of Donaghy, one of television’s greatest all-time characters, on “30 Rock,” which began in October 2006 and continued for seven seasons. However, this new book reveals that, despite working with his dear buddy Fey, Baldwin’s aversion to the show caused a lot of friction along the way.

According to the book, Bernstein was not the only film director who had problems with Baldwin. Baldwin was described as “challenging” and “least fun” to deal with by Paul Feig, who directed Bridesmaids and Ghostbusters and worked with Baldwin on a 30 Rock episode.

However, he said that this had a lot to do with the fact that the actor, who had previously mostly worked in cinema and theater, was seen as a major coup for the program.

Baldwin allegedly wanted to spend as little time on set as possible since he wasn’t sure if his bet on a TV sitcom would pay off. Baldwin disliked taking many takes or letting a scene drag out, according to Feig.

“In Alec’s case, he was like, I just want to get in and get out, [especially if] you wanted to do something elaborate…more than a few takes,” Feig is reported as saying.

“Alec is so brilliant that in two takes, you get something great. It’s just that as a director, then you go, ‘Ooh, try this,’ because I could maybe even make it ten percent greater, and he’s just like, ‘No, we got it.’”

Baldwin agreed to perform six episodes every season, while complaining the entire time, and would finally agree to more each year if the network purchased additional episodes. He did, however, only film three days a week, from Tuesday to Thursday, according to reports. He didn’t truly commit to the program until its last season, when he recognized how fantastic of a job he had. For the first time in the show’s history, he agreed to take a 20% salary reduction in exchange for a 13-episode order.

Things may have gone differently if Fey hadn’t been romantically involved when Baldwin and Fey first met years ago.

“When Baldwin first met Fey, he had asked SNL talent coordinator Marci Klein if Tina was single — at which time Klein pointed to Tina’s husband, [SNL music director] Jeff Richmond, off to the side,” Roe writes. “While Baldwin was initially dismissive of Richmond, wondering what she saw in him, he later developed respect and admiration for Richmond and his talent.”

Baldwin was hesitant to undertake the TV program in 2006 “before the rise of streaming, when the world still turned its nose up at the smaller screen,” according to the book, because he was recognized for his film appearances in The Hunt for Red October and The Aviator.