The new gamma-ray satellite GLAST foreseen for October/November 2007 provides a tremendous opportunity for future blazar studies. In order to fully benefit from the offered capabilities of this instrument and to interpret the high energy emission, it is of great importance to conduct dedicated multi-frequency campaigns that will produce comprehensive observations prior to and after the GLAST launch. GAMMA-project (GLAST AGN Multi-wavelength Monitoring Analysis) comprises a series of dedicated flux-density campaigns with the several facilities attempting an unprecedented frequency coverage. The 100-m Effelsberg, 30-m IRAM and OVRO radio telescopes will cover the radio and millimeter wavelengths. The REM telescope in Chile as well as the AIT in Italy and the 1.2-m telescope in Kryoneri take over the optical band. mm VLBI campaigns as well as sub-mm campaigns are also underway.