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We report the serendipitous discovery of a group or cluster of young galaxiesat $z\simeq$2.40 in a 24-orbit HST/WFPC2 exposure of the field around the weakradio galaxy 53W002. Potential cluster members were identified on ground-basednarrow-band redshifted Ly$\alpha$ images and confirmed via spectroscopy.  In addition to the known weak radio galaxy 53W002 at z=2.390, two otherobjects were found to have excess narrow-band Ly$\alpha$ emission at$z\simeq$2.40. Both have been spectroscopically confirmed, and one clearlycontains a weak AGN. They are located within one arcminute of 53W002, or$\sim0.23h_{100}^{-1}$Mpc ($q_o$=0.5) at $z\simeq$2.40, which is the physicalscale of a group or small cluster of galaxies. Profile fitting of the WFPC2images shows that the objects are very compact, with scale lengths$\simeq$0\farcs 1 ($\simeq0.39h_{100}^{-1}$kpc), and are rather faint(luminosities < L*), implying that they may be sub-galactic sized objects. Wediscuss these results in the context of galaxy and cluster evolution and therole that weak AGN may play in the formation of young galaxies.

The Serendipitous Discovery of a Group or Cluster of Young Galaxies at [ITAL]z[/ITAL] ≃ 2.40 in Deep [ITAL]Hubble Space Telescope[/ITAL] WFPC2 Images