Feudalism was a set of legal and military customs in medieval Europe that flourished between the 9th and 15th centuries, which, broadly defined, was a system for structuring society around relationships derived from the holding of land in exchange for service or labour.

Although derived from the Latin word feodum or feudum (fief), then in use, the term feudalism and the system it describes were not conceived of as a formal political system by the people living in the medieval period. In its classic definition, by François-Louis Ganshof (1944),feudalism describes a set of reciprocal legal and military obligations among the warrior nobility, revolving around the three key concepts of lords, vassals, and fiefs.

There is also a broader definition, as described by Marc Bloch (1939), that includes not only warrior nobility but all three estates of the realm: the nobility, the clerics, and the peasantry bonds of manorialism; this is sometimes referred to as a "feudal society". Since 1974 with the publication of Elizabeth A. R. Brown's The Tyranny of a Construct, and Susan Reynolds' Fiefs and Vassals (1994), there has been ongoing inconclusive discussion among medieval historians as to whether feudalism is a useful construct for understanding medieval society.

Jello Biafra (born Eric Reed Boucher; June 17, 1958, Boulder, Colorado) is an American musician, spoken word artist and leading figure of the Green Party of the United States. Biafra first gained attention as the lead singer and songwriter for San Francisco punk rock band Dead Kennedys. After he left the band, he took over the influential independent record label Alternative Tentacles, which he had co-founded in 1979 with Dead Kennedys bandmate East Bay Ray. Although now focused primarily on spoken word, he has continued as a musician in numerous collaborations.

Politically, Biafra is a member of the Green Party of the United States and actively supports various political causes. He ran for the party's Presidential nomination in 2000, finishing second to Ralph Nader. He is a staunch believer in free society, which is not to be confused with libertarianism or voluntary society (voluntaryism), who utilizes shock value and advocates direct action and pranksterism in the name of political causes. Biafra is known to use absurdist media tactics, in the leftist tradition of the Yippies, to highlight issues of civil rights and social justice.