[2] Eisman rose to prominence as an adolescent in New York after becoming involved in the activities of the children's organization of the Communist Party, the Young Pioneers of America (YPA).

[2] He was expelled from his school, PS 61, for leading a group of children who named themselves "The Lenin Unit" and distributed Communist pamphlets among New York schoolchildren.

The Congressional Inquiry led by New York Congressman Hamilton Fish III identified Eisman as the leader of an "agitation" that had reached an estimated 3,500 youths with Communist propaganda.

In April 1929 after thirteen-year-old African American Henry Clarke was murdered in New York after winning a race at a school athletic meeting, Eisman attended and organized protests in Harlem and the Bronx.

Pioneers including Eisman delayed the departure of Cunard Line's RMS Samaria (1920) by blockading the quayside in order to inconvenience Scouts travelling to an international jamboree in Birkenhead, England.

[1] Eisman was released in January 1930 but was arrested again soon after taking part in the large March 6 unemployment demonstration alongside adult Communist leaders William Z.

He was billed as the "deported militant leader of the working youth of New York" and his fellow eulogists included Sen Katayama, André Marty, and the future president of East Germany Wilhelm Pieck.

[14] Mary M. Leder notes in her book My Life in Stalinist Russia: An American Woman Looks Back that Eisman was deported to Siberia in the 1950s for maintaining contacts with the writer Anna Louise Strong who fell out of favour with the Soviet authorities.

After the death of Joseph Stalin, Eisman returned to Moscow and worked in the Soviet-American Friendship Society, visited Young Pioneer camps with lectures about his experience of living in the United States.