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Using new spectroscopic observations obtained as part of the VIMOS Ultra-DeepSurvey (VUDS), we perform a systematic search for overdense environments in theearly universe ($z>2$) and report here on the discovery of Cl J0227-0421, amassive protocluster at $z=3.29$. This protocluster is characterized by boththe large overdensity of spectroscopically confirmed members,$\delta_{gal}=10.5\pm2.8$, and a significant overdensity in photometricredshift members. The halo mass of this protocluster is estimated, by a varietyof methods, to be roughly $3\times10^{14}$ $\mathcal{M}_{\odot}$ at $z\sim3.3$,which, evolved to $z=0$ results in a halo mass rivaling or exceeding that ofthe Coma cluster. The properties of 19 spectroscopically confirmed membergalaxies are compared with a large sample of VUDS/VVDS galaxies in lowerdensity field environments at similar redshifts. We find tentative evidence foran excess of redder, brighter, and more massive galaxies within the confines ofthe protocluster relative to the field population, which suggests that we maybe observing the beginning of environmentally-induced quenching. The propertiesof these galaxies are investigated, including a discussion of the brightestprotocluster galaxy which appears to be undergoing vigorous coeval nuclear andstarburst activity. The remaining member galaxies appear to havecharacteristics which are largely similar to the field population. Though wefind weaker evidence of the suppression of the median star formation ratesamongst and differences in stacked spectra of member galaxies with respect tothe field, we defer any conclusions of these trends to future work with theensemble of protostructures that are found in the full VUDS sample.

VIMOS Ultra-Deep Survey (VUDS): Witnessing the Assembly of a Massive Cluster at z~3.3