No, you absolutely can, but you need representation. Most prisoner rights suits are started without lawyers, and the courts won't generally allow class actions without a lawyer, so there aren't many filed.

My case involved access to news and mail delivery. The mail delivery claim is left open for a future class action as the judge made an excellent ruling on it, just short of handing me victory. The person behind me can cite that persuasive ruling to bring a class action if they can find representation.