Sigma Gamma Rho has promoted unity among women and for years many alumnae chapters worked with individuals who were not members of Greek-lettered organizations. These women were organized into auxiliaries that had various names until 1954 when the sorority officially approved the organized affiliate group and accepted the name of "Philo" (Greek meaning, "friend") as their official name.

In 1980 the Philo's were organized on a national level and have grown to represent hundreds of women organized on a regional level as well. The Philo's have supported Sigma Gamma Rho’s aim to enhance the quality of life within every community financially and through service.

Membership Information

To become a member of the Philo Affiliate one must be a woman of good character, possess poise, self-control, interest, outstanding social qualities, and expertise in some particular field. She must have a high school education or its equivalent. She must be interested in promoting programs of the Sorority. She must also acquire an affirmative vote for membership by the Philo Affiliate Membership Committee. ​