What did stalin use to crush opposition to his communist regime

In order to maintain national security within its colonies in america, england constructed a series of forts along colonial boundaries for protection. true false

Historians are concerned with the accuracy of their writings and readings but are also aware of the inability of authors to know every angle of every story biases, perspectives, beliefs, and a variety of other differences history being told by one person at a time no one being totally accurate, as hard as we try really need on this, and you^^

Plz how did the jews of the diaspora preserve their heritage?