Many people have argued that a US-based Al Qaeda operative is behind the earlier Fall 2001 anthrax mailings in the US, and that the mailings served as a threat and warning.
1	Many	many	ADJ	JJ	Degree=Pos	2	amod	2:amod	_
2	people	people	NOUN	NNS	Number=Plur	4	nsubj	4:nsubj	_
3	have	have	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	aux	4:aux	_
4	argued	argue	VERB	VBN	Tense=Past|VerbForm=Part	0	root	0:root	_
5	that	that	SCONJ	IN	_	20	mark	20:mark	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	12	det	12:det	_
7	US	US	PROPN	NNP	Number=Sing	9	obl:npmod	9:obl:npmod	SpaceAfter=No
8	-	-	PUNCT	HYPH	_	9	punct	9:punct	SpaceAfter=No
9	based	base	VERB	VBN	Tense=Past|VerbForm=Part	12	amod	12:amod	_
10	Al	Al	PROPN	NNP	Number=Sing	11	compound	11:compound	_
11	Qaeda	Qaeda	PROPN	NNP	Number=Sing	12	compound	12:compound	_
12	operative	operative	NOUN	NN	Number=Sing	20	nsubj	20:nsubj	_
13	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	20	cop	20:cop	_
14	behind	behind	ADP	IN	_	20	case	20:case	_
15	the	the	DET	DT	Definite=Def|PronType=Art	20	det	20:det	_
16	earlier	early	ADJ	JJR	Degree=Cmp	20	amod	20:amod	_
17	Fall	fall	NOUN	NN	Number=Sing	20	compound	20:compound	_
18	2001	2001	NUM	CD	NumForm=Digit|NumType=Card	17	appos	17:appos	_
19	anthrax	anthrax	NOUN	NN	Number=Sing	20	compound	20:compound	_
20	mailings	mailing	NOUN	NNS	Number=Plur	4	ccomp	4:ccomp	_
21	in	in	ADP	IN	_	23	case	23:case	_
22	the	the	DET	DT	Definite=Def|PronType=Art	23	det	23:det	_
23	US	US	PROPN	NNP	Number=Sing	20	nmod	20:nmod:in	SpaceAfter=No
24	,	,	PUNCT	,	_	29	punct	29:punct	_
25	and	and	CCONJ	CC	_	29	cc	29:cc	_
26	that	that	SCONJ	IN	_	29	mark	29:mark	_
27	the	the	DET	DT	Definite=Def|PronType=Art	28	det	28:det	_
28	mailings	mailing	NOUN	NNS	Number=Plur	29	nsubj	29:nsubj	_
29	served	serve	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	20	conj	4:ccomp|20:conj:and	_
30	as	as	ADP	IN	_	32	case	32:case	_
31	a	a	DET	DT	Definite=Ind|PronType=Art	32	det	32:det	_
32	threat	threat	NOUN	NN	Number=Sing	29	obl	29:obl:as	_
33	and	and	CCONJ	CC	_	34	cc	34:cc	_
34	warning	warning	NOUN	NN	Number=Sing	32	conj	29:obl:as|32:conj:and	SpaceAfter=No
35	.	.	PUNCT	.	_	4	punct	4:punct	_
