Manganite compounds (La0.33Sm0.67)0.67Sr0.33-xBaxMnO3 with light Ba doping (x = 0.01, 0.03, 0.06, 0.09) have been investigated by EPR over the temperature range 110 – 450 K. It was found that the EPR linewidth behavior changed drastically in samples with these low Ba concentrations. For all the samples there was observed a transition from paramagnetic to ferromagnetic phase below the phase-transition temperature. EPR signals characteristic of Griffiths phase were observed in the samples with x = 0.03, 0.06, 0.09. The temperature dependence of the EPR linewidth in the paramagnetic phase was analyzed on the basis of variable-range-hoping model, which explained well the observed data.