A professional soccer league in the United States and Canada is called Major League Soccer (archived here).
It introduced a new “no political display” policy in 2019 (archived here). Iron Front flags were consequently prohibited by MLS, however this prohibition was later removed (archived here). Later, in 2023,
The group banned (archived here) “flags representing a country or nationality” that alluded to the Middle East conflict because of the Hamas-Israel war.
A news release purportedly issued by MLS Commissioner Don Garber was referenced in the Esspots post.
Although Google searches for the exact remarks ascribed to Garber shown here (archived here) and here (archived here) produced only repeats of the claim,
Garber is a legitimate MLS commissioner (archived here). There were no supporting reports from reliable media outlets found in the searches.