Rosalio Urias Munoz is a Los Angeles-based progressive social justice and peace activist, organizer, and writer/journalist. He was born in Flagstaff, Arizona on June 29, 1946 and moved with his family to Los Angeles a year later. His father, Rosalio F. Munoz, was born in Mexico, immigrating to the United States at five years of age. His mother, Maria, was from third and fifth generation immigrant families with earlier relatives migrating to the Tucson, Arizona area in the late 19th century. Both parents worked their way through college in the 1930s and met as teachers in Arizona. His father went on to get a Masters in Education at Arizona State Teachers College (now Arizona State University), an MSW at USC, and a PhD in Education from USC. He was among the highest ranking Mexican American administrators in the Los Angeles school district when he retired.

Rosalio Jr. graduated from UCLA in 1969 with a BA in History. He began his activism at UCLA when he became a leader in the student power/academic reform movement, helping found the student-led Experimental College and helping to edit the first student-published professor evaluation book. He became an early member of the United Mexican American Students, helping establish affirmative action programs. He was elected Educational Policy Commissioner of the undergraduate student body 1967-1968, and student body president 1968-1969. After graduation, Rosalio publicly refused induction into the armed forces during the Vietnam War on September 16, 1969 (Mexican Independence Day) and became a national leader and spokesman for the Chicano anti-Vietnam War movement and pro-social justice mass demonstration known as the Chicano Moratorium. In 1972, he was acquitted in federal court of charges of draft evasion. From 1972-1980, Munoz worked for the Center of Metropolitan Mission In-service Training (COMMIT), an ecumenical social action center. Centered in the East/Northest Los Angeles areas, he organized grassroots organizations and activities on issues of peace, police brutality, jobs, labor and civil rights, immigrant rights, and other issues. In 1978, he ran for a seat on the Los Angeles County Board of Supervisors, building a constituency for progressive issues, immigrant rights, Chicano empowerment and other issues. From 1980 to 1992, Munoz was a reporter for the People's World newspaper and an activist in the Communist Party USA. After September 11, 2001 Munoz became more active politically, particularly online, writing and blogging on contemporary issues, as well as on the developmental history of the Chicano Movement into the 21st century. In 2004, he renewed leadership responsibilities in the CPUSA becoming a Southern California organizer and again writing for the People's World. He also led in the formation of the online group, Latinos for Peace. Since 2008, Munoz has been semiretired and devoting more time to organizing online and physical exhibitions regarding Chicano progressive history.