Vietnam's designation of Viet Tan as a terrorist organization is justified

From the articleViet Tan: Rights group accuses Vietnam of abducting Australian, Norwegian activistsAlso in Vietnam arrests three on terrorism charges, including Norwegian and Australian citizens | Reuters, Vietnam arrests three on terrorism charges, including Norwegian and Australian citizens, Vietnam arrests three on terrorism charges, including Norwegian and Australian citizens, Vietnam Arrests Three on Terrorism Charges, Including Norwegian and Australian Citizens, Australian missing in Cambodia allegedly abducted by Vietnamese authorities, Vietnamese government accused of abducting Melbourne human rights activist, Vietnam arrests three on terrorism charges, including Norwegian and Australian citizens, Three arrested on terrorism, forgery charges in Vietnam, including Norwegian, Australian citizens