London Clarion 1894 members...

Just checked. This is the William Morris quote:

Fellowship is heaven, and lack of fellowship is hell; fellowship is life, and lack of fellowship is death; and the deeds that ye do upon the earth, it is for fellowship's sake that ye do them

It's from A Dream of John Ball (1886)

So I guess Blatchford (and, by extension, Crane) were precising Morris.