He studied law in Athens and Italy. He returned and entered the legal profession, where he distinguished himself for his integrity and honesty. He rose to the rank of Deputy Prosecutor of Appeals. He fought passionately for the eradication of the social scourge of the time, robbery, and for the consolidation of public life. In 1874, disgusted by corruption, he resigned his judicial office. Since then he has been involved in politics and social struggles.

In 1875 he was elected as a member of parliament of Kefalonia, where his old aristocratic family came from. He is considered one of the first socialist MPs and created his own parliamentary group. His group was descendants of the Radicals, progressive and liberal elements. Filaret and together with other radicals they founded the Democratic Association of Rigas. He engaged in anti-monarchist struggles while disapproving of foreign interference in the internal affairs of Greece. He was a cowardly fighter and for this reason he acquired fierce opponents. In a confrontation he had in Syntagma Square with the pro-monarchist deputy of Messolonghi, Dim.

In 1883 he was elected as a deputy of Attikovoitia and together with Ar. In 1883, he founded the People’s Party in Athens with Ar. A democratic party with principles and a perspective of renewal of political life and social structures. In 1885 he was re-elected as a deputy. The uncompromising Hoidas hardened his critical attitude towards the palace and its supporters. His attitude when the bill on the ‘Punishment of those who embezzled public money’ was rejected by the parliament of the time was typical of his unapologetic personality. Hoidas resigned from office and although the Parliament did not accept his resignation he did not come back! This attitude provoked the anger of the parastatal mechanisms who attempted to assassinate him. Since then he has been leading protests, writing fiery articles in newspapers in favour of human rights, freedom and equality.

On the occasion of an article in the newspaper Rambagia, against King George I and the successor Constantine, he was prosecuted and sentenced to 3 years imprisonment (31.5.1889). He was led to the prison of Chalkida where a year later he died from the hardships and the recurrence of his old wound ( or committed suicide according to others) without in the meantime asking for a pardon for his release , while he could.