Unmasking Antifa Act of 2018 This bill amends the federal criminal code to make it a crime for an individual, while in disguise, to injure, oppress, threaten, or intimidate a person: (1) who is exercising or enjoying a protected right or privilege, or (2) because the person has exercised a protected right or privilege. A violator is subject to criminal penalties—a fine, a prison term of up to 15 years, or both. Additionally, the bill establishes an enhanced penalty—a mandatory two-year prison term—for a person who wears a disguise during an offense involving the willful and malicious destruction of a building or property.