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We present high resolution (9$^{\prime \prime}$) imaging of theSunyaev-Zel'dovich Effect (SZE) toward two massive galaxy clusters, MACSJ0647.7+7015 ($z=0.591$) and MACS J1206.2-0847 ($z=0.439$). We compare these 90GHz measurements, taken with the MUSTANG receiver on the Green Bank Telescope,with generalized Navarro-Frenk-White (gNFW) models derived from Bolocam 140 GHzSZE data as well as maps of the thermal gas derived from {\it Chandra} X-rayobservations. For MACS J0647.7+7015, we find a gNFW profile with core slopeparameter $\gamma= 0.9$ fits the MUSTANG image with $\chi^{2}_{red}=1.005$ andprobability to exceed (PTE) = 0.34. For MACS J1206.2-0847, we find$\gamma=0.7$, $\chi^{2}_{red}=0.993$, and PTE = 0.70. In addition, we find asignificant ($>$3-$\sigma$) residual SZE feature in MACS J1206.2-0847coincident with a group of galaxies identified in VLT data and filamentarystructure found in a weak-lensing mass reconstruction. We suggest the detectedsub-structure may be the SZE decrement from a low mass foreground group or aninfalling group. GMRT measurements at 610 MHz reveal diffuse extended radioemission to the west, which we posit is either an AGN-driven radio lobe, abubble expanding away from disturbed gas associated with the SZE signal, or abubble detached and perhaps re-accelerated by sloshing within the cluster.Using the spectroscopic redshifts available, we find evidence for a foreground($z=0.423$) or infalling group, coincident with the residual SZE feature.

Measurements of the Sunyaev-Zel'dovich Effect in MACS J0647.7+7015 and MACS J1206.2-0847 at High Angular Resolution with MUSTANG