Your statement is false. There is nothing similar to the NPA in the USA. Since the NPA was founded in 1969, over 40,000 Filipinos have been killed in attacks and fighting. There is ongoing warfare since 1969 between the government and the NPA, on virtually every significant island in the Philippines. For over 38 years, the NPA has made frequent assaults and bombings on military units, police stations, government buildings, airports, infrastructure etc. There is no group in the USA waging daily armed warfare against government/public targets. If they did, they would be promptly squashed.