At the beginning of February 2020, law enforcement authorities from 23 EU Member States conducted a major operation against Organised Crime Groups (OCGs) involved in fuel fraud. The operation led to 59 arrests, the seizure of 5.2 million litres of designer fuel worth approximately €6.8 million, and the seizure of €331,000 and other assets. It was led by the Hungarian National Tax and Customs Administration and the Slovak Financial Administration. Fuel fraud is a growing phenomenon used by OCGs to avoid excise duties. It typically involves base-oil fraud, also called designer fuel fraud, and fuel laundering.