What is sufficient to support an allegation of retaliation against a prisoner's right to file a prison grievance?

An allegation of retaliation against a prisoner's First Amendment right to file a prison grievance is sufficient to support a claim under section 1983. Bruce v. Ylst, 351 F.3d 1283, 1288 (9th Cir. 2003). The court must "'afford appropriate deference and flexibility' to prison officials in the evaluation of proffered legitimate penological reasons for conduct alleged to be

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retaliatory." Pratt, 65 F.3d at 807 (9th Cir. 1995) (quoting Sandin v. Conner, 515 U.S. 472, 482 (1995)). The burden is on Plaintiff to demonstrate "that there were no legitimate correctional purposes motivating the actions he complains of." Pratt, 65 F.3d at 808.