He worked variously as a newsboy, a clerk in a grocery store, as a worker in a clothing factory, and in a soda shop during his earlier years.
Weisbord was initially a member of the syndicalist Industrial Workers of the World (IWW), but he soon moved to the ranks of the Socialist Party of America (SPA), an organization which believed in the efficacy of electoral politics to implement change.
[2] In the summer of 1921, the party's National Executive Committee asked him to conduct a speaking tour to help reorganize the Young People's Socialist League, the bulk of which had exited the SPA to join forces with the Communists.
After going on tour to reorganize the locals, a national convention was held to relaunch a new YPSL (loyal to the Socialist Party) at Fitchburg, Massachusetts.
[1] Later that year, he attended the meeting of the Conference for Progressive Political Action at which the Socialist Party joined with a number of unions to nominate Robert La Follette as an independent for President of the United States.
[5] Weisbord was sent to Moscow in the spring of 1928 as a delegate of the Communist Party's Trade Union Educational League (TUEL) to the World Congress of the Profintern that opened on March 10, 1928.
[6] His selection no doubt was intended in part as a faction-balancing measure, owing to Weisbord's status as one of the top Lovestone loyalists in the Communist Party's labor arm, TUEL being the main center for the opposition faction of William Z.