This refers to the alleged scanning of all Usenet traffic by the National Security Agency (and possibly other intelligence organizations) for interesting keywords.
1	This	this	PRON	DT	Number=Sing|PronType=Dem	2	nsubj	2:nsubj	_
2	refers	refer	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	_
3	to	to	ADP	IN	_	6	case	6:case	_
4	the	the	DET	DT	Definite=Def|PronType=Art	6	det	6:det	_
5	alleged	allege	VERB	VBN	Tense=Past|VerbForm=Part	6	amod	6:amod	_
6	scanning	scanning	NOUN	NN	Number=Sing	2	obl	2:obl:to	_
7	of	of	ADP	IN	_	10	case	10:case	_
8	all	all	DET	DT	_	10	det	10:det	_
9	Usenet	Usenet	PROPN	NNP	Number=Sing	10	compound	10:compound	_
10	traffic	traffic	NOUN	NN	Number=Sing	6	nmod	6:nmod:of	_
11	by	by	ADP	IN	_	15	case	15:case	_
12	the	the	DET	DT	Definite=Def|PronType=Art	15	det	15:det	_
13	National	National	ADJ	NNP	Degree=Pos	15	amod	15:amod	_
14	Security	Security	PROPN	NNP	Number=Sing	15	compound	15:compound	_
15	Agency	Agency	PROPN	NNP	Number=Sing	6	nmod	6:nmod:by	_
16	(	(	PUNCT	-LRB-	_	15	punct	15:punct	SpaceAfter=No
17	and	and	CCONJ	CC	_	21	cc	21:cc	_
18	possibly	possibly	ADV	RB	_	21	advmod	21:advmod	_
19	other	other	ADJ	JJ	Degree=Pos	21	amod	21:amod	_
20	intelligence	intelligence	NOUN	NN	Number=Sing	21	compound	21:compound	_
21	organizations	organization	NOUN	NNS	Number=Plur	15	conj	6:nmod:by|15:conj:and	SpaceAfter=No
22	)	)	PUNCT	-RRB-	_	15	punct	15:punct	_
23	for	for	ADP	IN	_	25	case	25:case	_
24	interesting	interesting	ADJ	JJ	Degree=Pos	25	amod	25:amod	_
25	keywords	keyword	NOUN	NNS	Number=Plur	6	nmod	6:nmod:for	SpaceAfter=No
26	.	.	PUNCT	.	_	2	punct	2:punct	_
