I would first off state that we do not consider ourselves as a 'secret' society. How many real secret societies have big signs outside their buildings, wear obvious rings and t-shirts or - come to think or it - run public websites? We are a society eith a few secrets, that's all.
As to your real question, it can be taken in two ways. First, individual Freemasons retain their freedom of association. A Mason wishing to join Rotary or the Rosicrucians is free to do so. Second, while there are various concordant bodies like the Shrine and Scottish Rite comprised of Masons, Freemasonry does not - not - have any alliance or such with non-Masonic organizations.
Hope that helps.
Jul 11, 2016 Rating
Oops by: Lant
On rereading your question, I see it was in the past tense. Sorry.
Same answer, though. So far as I know, despite individual Masons no doubt having had dual memberships, there has never been any sort of institutional alliance.