Some doubted that Sacco and Vanzetti received fair trials because they were: A Communists
.
B. poor

C. Republicans

D. immigrants

D, immigrants

Explanation:

They were Italian immigrants and radical militant anarchists, and feelings were charged in the community toward these groups.

Nicola Sacco and Bartolomeo Vanzetti, Italian immigrants and anarchists, were executed for murder by the state of Massachusetts in 1927 on the basis of doubtful ballistics evidence and were executed by electric chair, August 23, 1927. During their trials Witness testimony was ignored. They were found guilty even though another man, Celestino Maderios confessed to the murders.

from the conditions of the working class in england by friedrich engels,the main idea is :

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)