Despite warning lawmakers to avoid looking at Fannie Mae’s and Freddie Mac’s guarantee fees as a (mostly) untapped revenue stream to pay for pet projects, mortgage industry officials say they remain on high alert to repel raids from a cash-hungry Congress. G-fees on Fannie and Freddie single-family mortgage-backed securities have been edging higher over the past year and in April took a 10 basis point leap higher. While there is debate within the industry whether to hike or to hold g-fees as a way to further a post-crisis recovery, all agree that the funds the GSEs charge lenders must stay with Fannie and Freddie.