"Old boys club" may not be entirely proper given that there may possibly be women with bias towards women in science, but the phrase is still uselful in that it easily conveys the mindset of the people involved.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell