Amorphous molecular magnetic materials Ni2(OA) (OA:organic acceptor) were reported to exhibit ferromagnetism with Curie temperatures >400K. This work is controversial as it has been claimed that nickel nanoparticles may explain these observations and hence implies that the materials are magnetically inhomogeneous; muon spin relaxation may be an important probe to resolve this controversy. We propose to carry out transverse and zero field measurements of Ni2TCNQ (TCNQ: tetracyanoquinodimethane), reported to have Tc = 480K, as well as the tetrafluoro-derivative, NiTCNQF4. We will measure muon spin relaxation between 12 K and 550K to investigate the magnetic properties above and below the magnetic transition. For comparison, we also propose to carry out similar measurements on Ni(TCNQ)2, a crystalline material which is believed to exhibit a bulk glassy ferromagnetic ordered state at T<20K.