The connection to public organizations is really a political thing.
Unless the soccer club is known for radical political activity or violence, then they should be fine.
If coworker is politically active, member of communist / leftist party, or extremely outspoken online then they should take additional precautions.
They should also avoid any recreational drugs other than alcohol before coming, and review any medication carefully, as laws in Florida are strict.
As others have said, racial profiling is always possible, but extremely unlikely.
So a lot of the potential risk depends on the details. What language do they speak, what country are they traveling from, what particular political affiliations and activities they are part of, etc.
I'm not an expert, but feel free to DM me if you don't want to share more info widely (although remember that direct messaging on lemmy is not secure or private).
They are primarily looking to catch troublemakers and drug traffickers. However, what may be considered a troublemaker is broad and unfair.