The organic radical crystal, 3-(4-chlorophenyl)-1,5-dimethyl-6-thioxoverdazyl (p-CDTV), has been revealed to be a new and bulk ferromagnet with the second highest Curie temperature T-C = (0.67+/-0.02) K of genuine organic ferromagnets by the simultaneous measurements of heat capacity and magnetic susceptibility. On the other hand, 3-(4-bromophenyl)-1,5-dimethyl-6-thioxoverdazyl (p-BDTV) behaves as a one-dimensional antiferromagnet with an intermolecular interaction of 2J/k(B) = -41.2 K.