He is conducting research on a new energy source.

He is researching about a new energy source.

We should take responsibility as part of society.

He deeply believed in the principles of state socialism.

He deeply believes in the principles of state socialism.

He was opposed to the principles of National Socialism.

Democratic socialism is a political theory that aims for a fair society.

Ethnic socialism is known as a synonym for Nazism.

He said he couldn't agree with the views of the revisionists.

I am very interested in social science.