The Philadelphes was a masonic lodge founded in France in the 1750s and which became a centre for conspiratorial revolutionary activity. It had seemingly close ties with French revolutionary Charles Nodier (presumed grand master of the prieure de' sion at the period.) Nodier even spoke of the secret society after he published his book on the subject in 1822.
In the beginning it was made up mainly of French émigrés. From 1852 onwards, it had close ties with the political group La Commune Révolutionnaire, which it appears to have founded, as all of the prominent members of one organization were members of the other. Although some associates of Blanqui were involved, such as Jean Baptiste Rougé and Theophile Thoré, they did not play a prominent role. This was taken rather by Montagnards or Jacobins, most of them with a long track record of conspiratorial politics.
Aside from La Commune Révolutionnaire, they also founded the "International Association", which existed from 1855 to 1859. Its principal tasks, as set out in its constitution, consisted of spreading the doctrine of solidarity and preparing to implement "the ideal of our hearts, the Universal Democratic and Social Republic". However, despite trying to develop ties with English Chartists, it remained an organisation of émigrés in England and America. Although it has been claimed that this was the first form of international proletarianism, it remained a conspiratorial group more like Mazzini's Young Europe. They were also supporters of individual acts of terror. Following Felice Orsini's attempt on Napoleon III's life, the British government tried to put Simon François Bernard, another émigré, on trial. The Philadelphians defended both Bernard's actions and the assassination of tyrants. Indeed Adolphe Talandier, Gustave Jourdain, Joseph Holyoake and Félix Pyat (all Philadelphians) were the only people who spoke at his funeral a few years later. They also laid on a banquet (under the name of the Lodge) for Paolo Tibaldi when he arrived in London after serving a prison sentence for an attempt on the life of Napoeon III. Louis Blanc, Talandier and Gustave Flourens (another Philadelphian) spoke on this occasion.