Sen. Ashley Moody (R-FL), Mitch McConnell (R-KY), and Roger Marshall (R-KS) are three of the US senators with ties to Greek life sororities and fraternities. Bill Clark/CQ-Roll Call, Inc via Getty Images/Pete Kiehart/Bloomberg via Getty Images/Michael M. Santiago/Getty Images

Beyond party affiliation, there are some lesser-known loyalties tied to lawmakers in Washington, DC .

Greek life fraternities and sororities , which often dominate social life in colleges and universities across the US, also have some of the strongest footprints in the Capitol.

In the 119th Congress, just under a third of US senators are affiliated with a Greek organization, according to the Fraternity and Sorority Political Action Committee , which aims to "help more Greek alumnae get elected to the House or Senate for the first time."

In years with congressional races throughout the country, the political action committee — often nicknamed the "Frat PAC" — can play a significant financial role.…