The Libertarian Party has recently taken a more active role in opposing the Yemeni War, a war of genocide backed by more than $50 billion in US government military aid as well as technical advice from the Pentagon.
The Libertarian Party of Massachusetts strongly encourages its members to call their congressman and senators to back HJ Res 87, the War Powers Resolution on Yemen.
Call 1-833 STOP WAR and they will connect you to your Representative.