He was a radical republican and was dismissed from his position as mayor of Toulon by the monarchist ministry of Albert de Broglie in 1873.

[3] Allègre was a radical Republican, a supporter of the Paris Commune, who protested the executions of Louis Rossel and Gaston Crémieux in November 1871 and veiled the tricolour flag at the Town Hall as a sign of mourning.

He voted with the majority for invalidation of the election of Louis Auguste Blanqui, for return of the Assembly to Paris, for application of existing laws to congregations, for free and compulsory primary education and for the vote of confidence in the Jules Ferry ministry on 11 November 1880.

[3] On 20 July 1881, a few days before the next general elections, Allègre accepted the position of Governor of Martinique and resigned as deputy.

[3] In December 1881 Allègre said the clergy of the island was aligned with "the small reactionary minority", and Bishop Carméné(fr) had agreed with "parties hostile to the Republic" to make out that the colony was totally disorganized.

A commission of members of the General Council undertook an investigation of damages that Allègre described as "meticulous" and estimated the total costs were almost 89 million francs.

[9] Allegre wrote to the colonial office of the Ministry of Marine protesting that the outside inspectors did not understand the true losses of Martinique's "energetic population who, in trying to lift itself up, will use up its last resources and count on the future as well as the goodwill of the mother country."

Allegre continued to pressure the government to arrange a loan to fund reconstruction and to provide tariff relief on sugar and tafia exports.