He later studied in Metropolitan France before returning to Guiana, where he would campaign for the Union of Guyanese Students (UEG).

[4] In 1985, he was one of the founders of Rot Kozé, which was created shortly after the founding of the Decolonization and Social Emancipation Movement (MDES).

[4] In the 2022 legislative election, Castor ran to represent French Guiana's 1st constituency in the National Assembly.

[7] On May 4, 2023, a parliamentary day reserved for his GDR group, he presented a bill to repeal compulsory anti-Covid vaccinations for healthcare workers.

[8] The newspaper Marianne says that he traveled twice, in July and November 2023, all expenses paid, to Baku in Azerbaijan for a conference on the fight against "colonialism".