Kenneth Leland Morgan — the man who allegedly dressed in a Nazi costume before striking a University of Georgia student with a beer stein — was denied entrance into the college bar, Cutters, because of the Gestapo uniform, TMZ has learned.

According to a police report, obtained by TMZ … customers at Cutters say they met Morgan outside the bar, along with bar staff, and told him “he couldn’t come in while dressed as a Nazi.”

As the argument grew heated, Morgan’s alleged victim — identified as Alexandra Lang — apparently swiped at his Nazi armband to remove it. According to police, Alexandra moved away from Morgan but witnesses say he responded by pulling her towards him and striking her in the face with “a large glass beer stein.”

The bar manager, Bryce Fowler, later called Morgan and told him he was barred from the premises.

According to legal docs — obtained by TMZ — Morgan’s been charged with felony aggravated assault and misdemeanor simple battery. Morgan’s bail has been set at $15k.

Sources tell us the alleged victim suffered a black eye, a broken nose, and needed stitches.