The protesters, who prevented the staff from going in and out of the complex, paralysed the administrative activities and vehicular movement in the complex.
The protesters called on the leadership of the union to call for strike and mass action against the anti-people policies of President Muhammadu Buhari's government.
Speaking on behalf of the group, Gerald Katchy, described the silence by organised labour as unacceptable and wicked, adding that the hike would heighten inflation pressure and worsen the living standards of Nigerians.
He said, "We say no to fuel price increase and hike in electricity tariffs. We want NLC President, Ayuba Wabba, and TUC to call for total strike and shutdown of all sectors of economy until this wicked and insensitive government reverse fuel pump price to N87.
"If you are silent to the bad policies, you are still a slave. If you are afraid to speak up in the face of bad governance, you are still a slave. The only way we can be assured that NLC President has not compromised is for him to take action and call for strike."
He accused the union of compromise and conspiracy despite the hues and cries by Nigerians on the policies and laws being implemented by the government.
Katchy also called for the reversal of Value Added Tax from 7.5 per cent to five per cent.
The activists vowed to continue to protest and occupy the secretariat of the union until the leadership calls for nationwide protest.
Other demands of the group include rationalisation of the power and oil sector, provision of free prepaid meters for consumers, end to jumbo pay to political office holders and building of more refineries and others.