Hi David,
I have seen it mentioned in a few books over the years. A noted regimental historian, Jeffrey Weaver, has done a bit of writing on this organization, especially where it pertains to units where it was rumored to have infiltrated. Here is a link to some of his writing on rumored Red Stringer connections to the 58th North Carolina:
http://hometown.aol.com/jweaver301/nc/58ncinf.htm
Regards,
John w.