Born to Harry Brod and Sarah "Sally" Kandel Brod, both of them New York born Jews, Lynn married Murray Singer in New York in 1948, and was initially a housewife living in Queens, and then Long Island, raising two children, before becoming more and more involved in community activism and civil rights.
Throughout the 1980s, Singer personally made long-distance phone calls to refuseniks trapped in Moscow and Leningrad daily, as part of a grassroots network of activists run by Cleveland scientist and Soviet Jewry activist Lou Rosenblum.
[2] She was the national coordinator in the United States for the group Women for Ida Nudel (WIN), which appealed to elected women officials to press for the release of Ida Nudel, an anti-Soviet activist who was sentenced to four years in a Siberian prison after seven years of challenging the Soviet treatment of Jewish political prisoners.
After Mikhail Gorbachev's glasnost policy in the late 1980s started to release some of the more high-profile refuseniks from prison, and allowed some of them to emigrate, Singer and her fellow activists continued to fight, but began concentrating more on more typical Soviet Jewish families who were still trapped behind the Iron Curtain.
Members of the association (Amuta) Remember and Save referred to her as "our Yiddishe Mama" and counted her as a family friend.