Wikipedia describes democratic centralism as follows:
The democratic aspect of this organizational method describes the freedom of members of the political party to discuss and debate matters of policy and direction, but once the decision of the party is made by majority vote, all members are expected to uphold that decision. This latter aspect represents the centralism. As Lenin described it, democratic centralism consisted of "freedom of discussion, unity of action."
When defined as such, is this limited to Leninism? As a principle, I see no fundamental reason why it cannot be applied by groups with very different political convictions. Is democratic centralism limited to Leninism, or are there any significant examples of wholly different groups applying "freedom of discussion, unity of action"?
P.S. I am not after a discussion about the Leninist system in theory vs. the Leninist system in practice.