CucCo1-cCl2-FeCl3 graphite bi-intercalation compounds (GBIC's) have a c-axis stacking sequence of -G-I-1-G-I-2-G-I-1-G-I-2-G-(G = graphite layer, I-1 = CucCo1- Cl-c(2) layer, and I-2 = FeCl3 layer). These compounds undergo magnetic phase transitions at T-h, T-cu, T-cl, T-SG, and T-RSG (T-h>T-cl>T(RSG)approximate to T-SG), depending on the Cu concentration. The phase transition at Th is related to a helical spin order. The phase transitions at T-cu and T-cl are associated with a spin order of CucCo1-cCl2 layers. The re-entrant spin glass phase below T-RSG for c less than or equal to 0.4 and the spin glass phase below T-SG far c greater than or equal to 0.5 are due to the spin frustration effect occurring in FeCl3 layers. The nature of these phases has been studied using SQUID DC magnetization and SQUID AC magnetic susceptibility.