Zurarah ibn A`yyan or A`yyun, one of the top companions of the Imams and an important Shi`ee narrator, a couple of things were attributed to him:
A- The Imams cursed him.
B- The Imams stated that he has corrupt beliefs such as al-Jabr and Nafi al-Istita`ah.
C- It was reported that he did not believe in the Imamah of al-Kadhim although he lived in his days.
Then on the other hand, we have a defense for him, this defense seems to be mainly coming from his relatives and children, which raises great doubts in my heart towards this "defense".
On the other hand, we find that al-Khu'i quotes this Hadith in praise of al-`Abbas (ra), and comments on it:
عن ابن عباس قال: قال رسول الله (صلى الله عليه وآله) : من آذى العباس فقد آذاني
وهي مروية عن ابن عباس ، وكيف يمكن الاعتماد على مثل ذلك
[Ibn `Abbas said: The Prophet (saw) said: "Whoever hurts al-`Abbas has hurt me." This was narrated from ibn `Abbas, so how can we rely on such a thing!?]
I say: How can you rely on the narrations of the son of a cursed man?
Our question is, has been established from other authentic chains, not containing sons of Zurarah or relatives of his, that the curses weren't serious but only out of Taqiyyah?Secondly, if we were to accept that there are authentic narrations where the Imam cursed him out of Taqiyyah, so that he won't get him into trouble with "the enemies of Ahlul-Bayt", how can we reconcile this with the content of the narrations in which the Imam curses him?
Let me clarify, for example in one narration some Shia come to the Imam and ask him regarding the authenticity of what Zurarah attributed to him concerning matter related to Istita`ah and Hajj, the Imam accuses Zurarah of lying and denies this belief, after this in the same narration Zurarah insults the Imam by accusing him of ignorance.
Zurarah is said to even have a book on Istita`ah and kept this belief until his death, and the brother Asad posted more here in Arabic:
http://www.dd-sunnah.net/forum/showthread.php?t=173379