French to English Other Government / Politics

Hello,

I'm working on a translation of a letter from a Cameroonian concerning his political party. Due to the confidentiality of the document, that is all the context I can provide.

Here is the source: "M. H**** était principalement responsable de réunir et rassembler les jeunes et leur expliquer que le changement est encore possible dans nos pays, que l'heure n'est pas au découragement, qu'il y a encore espoir, ceci par le billais de l'**** (the political party) et de son président M. J*****.

I can't find any translation for "le billais" except as a conjugation of "biller" or "to hard-hammer." I have a feeling that it's a typo, in which case, I'm not sure what it might be.

Here is my current translation of the sentence:

"M. H**** was primarily responsible for bringing together and uniting the youth and explaining to them that change is still possible in our country, that it is not time for discouragement, that there is still hope, these by the ???? of the *****(political party) and its president, M. J****."

Any assistance would be greatly appreciate me. Also, feel free to correct any faults in the body of my translation.