Just because he didn't commit the Tate-LaBianca murders doesn't mean he's innocent. The members of the Manson family carreied out the murders at the instruction of Mr. Manson. Through the joint-responsibility rule of conspiracy, he was convicted of the murders in addition to his co-conspirators.
You're probably one of those idiots who thinks OJ is innocent.
Now, as to your question "have any other citizens been convicted on these grounds", I can only assume that you're asking if any other citizens have been convicted on the grounds that they are guilty by joint-responsibility. Yes, but I'm unable to find a comprehensive list.