Unmasking Antifa Act of 2019 This bill establishes a new offense and strengthens the penalty for certain existing offenses involving prohibited conduct while wearing a disguise. Specifically, it establishes a new criminal civil rights violation for wearing a disguise while interfering with another person's exercise of 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.