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We present a multi-wavelength analysis of eleven Sunyaev Zel'dovich effect(SZE)-selected galaxy clusters (ten with new data) from the Atacama CosmologyTelescope (ACT) southern survey. We have obtained new imaging from the LargeAPEX Bolometer Camera (345GHz; LABOCA) on the Atacama Pathfinder EXperiment(APEX) telescope, the Australia Telescope Compact Array (2.1GHz; ATCA), and theSpectral and Photometric Imaging Receiver (250, 350, and $500\,\rm\mu m$;SPIRE) on the Herschel Space Observatory. Spatially-resolved 345GHz SZEincrements with integrated S/N > 5 are found in six clusters. We compute 2.1GHznumber counts as a function of cluster-centric radius and find significantenhancements in the counts of bright sources at projected radii $\theta <\theta_{2500}$. By extrapolating in frequency, we predict that the combinedsignals from 2.1GHz-selected radio sources and 345GHz-selected SMGs contaminatethe 148GHz SZE decrement signal by ~5% and the 345GHz SZE increment by ~18%.After removing radio source and SMG emission from the SZE signals, we use ACT,LABOCA, and (in some cases) new Herschel SPIRE imaging to place constraints onthe clusters' peculiar velocities. The sample's average peculiar velocityrelative to the cosmic microwave background is $153\pm 383\,\rm km\,s^{-1}$.

The Atacama Cosmology Telescope: The LABOCA/ACT Survey of Clusters at All Redshifts