Act No. 21 of 2000 on Trade Unions ; Act No. 13 of 2003 on Manpower (In line with the Constitutional Court Decision No. 012/PUU-I/2003) ; Act No. 2 of 2004 on Industrial Relations Disputes Settlement ; Explanatory Notes on Goverment Regulation In Lieu of Act of the Republic of Indonesoa Number 1 Year 2005 concerning Postponing the Effectivity of Act Number 4 Year 2004 on Industrial Relations Dispute Settlement.