It is estimated that some 20% of Esperanto leaders and 3–4% of ordinary Esperantists defected to Ido, which from then on suffered constant modifications seeking to perfect it, but which ultimately had the effect of causing many Ido speakers to give up on trying to learn it. Although it fractured the Esperanto movement, the schism gave the remaining Esperantists the freedom to concentrate on using and promoting their language as it stood. At the same time, it gave the Idists freedom to continue working on their own language for several more years before actively promoting it. The "Uniono di la Amiki di la Linguo Internaciona" ("Union of Friends of the International Language") was established along with an Ido Academy to work out the details of the new language.