[Ray76]

Here is a primer discussing Congressional inquiry, subpoena, and enforcement powers.

http://www.constitutionproject.org/documents/when-congress-comes-calling-a-primer-on-the-principles-practices-and-pragmatics-of-legislative-inquiry/

[okie01]

Here is a primer discussing Congressional inquiry, subpoena, and enforcement powers.

Fine.

Then, why haven't they done it since 1934? That's either party.

As I have pointed out -- on several occasions -- I'm not arguing with your premise that Congress has the authority to arrest and detain contemnors.

Instead, I am questioning whether they any longer have the ability to that, much less the will!

You have yet to address this question. Or even recognize it...