Its formative membership included the Mattachine Society chapters in New York and Washington D.C., the Daughters of Bilitis chapter in New York, and the Janus Society in Philadelphia, which met monthly.
[1] Philadelphia was chosen as the host city due to its central location among all involved parties.
By 1969 ERCHO members included New York's Council on Equality for Homosexuals and the Student Homophile League, Philadelphia's Homophile Action League, Hartford's Institute for Social Ethics, and the West Side Discussion Group,[4] in addition to the original ECHO members.
At the November 1969 ERCHO meeting in Philadelphia, Craig Rodwell, Fred Sargeant, Ellen Broidy and Linda Rhodes submitted a resolution for a march to be held in New York City to commemorate the "spontaneous demonstrations on Christopher Street", which had occurred in June.
ERCHO, NACHO, and other homophile movements collapsed with the rise of more radical gay liberation politics following the Stonewall riots, and the final NACHO meeting took place in 1970.