Final answer:
The provided references do not specify when women were allowed into Gamma Chapter as brothers, and typically, fraternity and sorority organizations are not mixed-gender. Women often founded their own separate sororities, such as Alpha Kappa Alpha Inc. at Howard University in 1908.
Step-by-step explanation:
The question about the year when women were allowed into Gamma Chapter as brothers pertains to the history of fraternities and sororities, particularly those established at historically black colleges and universities (HBCUs). However, the provided reference materials do not contain specific information about women being allowed as brothers into any Gamma Chapter. Notably, the Gamma Chapter terminology is too broad to identify a specific organization without additional context as there could be many different fraternities or sororities with a Gamma Chapter. If the question refers to a specific organization within the National Pan-Hellenic Council, it's important to note that these councils traditionally include either fraternities or sororities but not mixed-gender organizations. Typically, women were founding members of their own organizations, as it was the case with Alpha Kappa Alpha Inc., established in 1908 at Howard University.