solidarity based on .... ?

in the book 'People Power' Howard Clark argues (p. 153) that

some solidarity is based on a sense of common identity (eg gender, race)

some is based on common interests (he gives the example of workers and small farmers)

and some on common moral or political beliefs (he gives pacifism and socialism)

and some on religious faith.

I had never heard it put quite that way. But what about solidarity around similar visions of a better world, of equality, dignity, justice, respect for life - even if you disagree on exactly how to get there?