Noone knows who they 'truly' are. They are hidden behind a web of NGO's, news organizations, political offices, activist groups... But look up Democratic Socialists of America... And the CCP. And Cuba.
This is a foreign and domestic threat and has been a threat since the 1910's...
Once people got it through their heads that Marx and Lenin would create a utopian society for their worthless asses, they drank the Kool-Aid.
The sad part is that these losers are always the first one shot, hanged, sent to Siberia and banished to the forced labor camps. But they keep believing that "Real Socialism has not been tried" because Socialism predicted socialism would not work... as long as enemies of socialism (the ones whose money and property are taking) existed. Thus you need to kill off the people whose money and property you are taking.
Ask the Kulaks or Chinese landowners... or the Vietnamese landowners... and how many Cambodians? Cubans? East Germans? Africans? Anywhere socialism lands, there is carnage. But I guess that's not 'real' socialism.
Sirhr