German airline Lufthansa has been fined $4 million for not allowing 128 Jewish passengers to board a flight in May 2022.

It was the largest penalty ever issued against an airline for civil rights violations, said the U.S. Department of Transportation (DOT) in a news release on Tuesday.

“Despite many of the passengers not knowing each other nor traveling together, passengers interviewed by DOT investigators stated that Lufthansa treated them all as if they were a single group and denied them boarding for the alleged misbehaviour of a few,” the department said.