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Bryce Harper was allegedly threatened by a Major League Baseball official over the summer ... this according to a bombshell claim made by a big-time agent.

Here's the deal ... Allan Walsh -- a superagent who reps National Hockey League players -- made the allegations on his "Agent Provocateur" podcast which he hosts alongside podcaster Adam Wylde . Play video content

Walsh mentioned a widely reported incident over the summer ... when baseball insiders claimed MLB Commisioner Rob Manfred came into the Philadelphia Phillies locker room and attempted to talk to the players about a salary cap.

The Associated Press -- citing an anonymous source -- alleged Harper cussed out Manfred ... a claim Harper never denied. Getty

Now, Walsh -- who is NOT Harper's agent --

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