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We present multi-frequency Very Long Baseline Array (VLBA) follow-upobservations of VLBA Imaging and Polarimetry Survey sources identified aslikely compact symmetric objects (CSOs) or super-massive binary black holes(SBBHs). We also present new spectroscopic redshifts for 11 sources observedwith the Hobby-Eberly Telescope. While no new SBBHs can be confirmed from theseobservations, we have identified 24 CSOs in the sample, 15 of which are newlydesignated, and refuted 52 candidates leaving 33 unconfirmed candidates. Thisis the first large uniform sample of CSOs which can be used to elicit some ofthe general properties of these sources, including morphological evolution andenvironmental interaction. We have detected polarised emission from two ofthese CSOs the properties of which are consistent with Active Galactic Nucleiunification schemes.

Compact Symmetric Objects and Supermassive Binary Black Holes in the VLBA Imaging and Polarimetry Survey