Party leaders made the remarks while addressing journalists and supporters at the party's offices on Katonga Road, where they called for the protection of freedom of expression and other constitutional rights.
PFF leaders argued that the government was undermining rights guaranteed under Article 29 of the Constitution, which protects freedom of speech and expression.
The party cited the reported disappearance of former Ethics and Integrity minister Miria Matembe, the closure of Nation Media Group outlets and the continued detention of opposition figures, including Dr Kizza Besigye and Erias Lukwago, as examples of what it described as a shrinking civic space.
PFF also called for the Uganda Communications Commission (UCC) to operate independently without political interference.
In addition, the party urged the government to issue clear guidance to security agencies on handling cases involving social media users and to ensure security personnel operate within the law when dealing with citizens.
Deputy Party President for the Buganda Region Lulume Bayiga said continued restrictions on freedom of expression threaten Uganda's democratic principles.
"Freedom of expression is a constitutional right that every Ugandan deserves to enjoy without fear. We demand the immediate release of all political detainees, an independent Uganda Communications Commission, and an end to unlawful arrests and intimidation by security agencies," Bayiga said.
He also called on security agencies to uphold human rights while carrying out their duties.
"Security forces should protect citizens, not intimidate them. The government must guide security agencies on handling social media matters lawfully and ensure that no one is punished simply for expressing their views," he said.
The government had not responded to the issues raised by the party by press time.
The demands come amid continuing debate over the balance between national security, constitutional freedoms and media independence.
PFF maintained that protecting freedom of expression is essential for strengthening democracy, accountability and public participation, and urged all stakeholders to uphold the rule of law and safeguard the constitutional rights of Ugandans.