The statement that best describes labor unions in Europe during the Great Depression is: Some nations supported unions, while other nations outlawed them.
During this period, the response to labor unions varied significantly across different countries. Some nations, particularly those with democratic governments, allowed and even supported unions as a means for workers to organize and advocate for their rights. On the other hand, some authoritarian regimes viewed unions as a threat to their power and either restricted or outright banned them. Hence, the situation was quite heterogeneous across Europe during the Great Depression.