Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The unlimited liberty of migration had already at an earlier period been taken from the Latin communities, and migration to Rome was only allowed to them in the event of their leaving behind children of their own and a portion of their estate in the community which had been their home.(28)
28. Cf. III. VII. Latins
But these burdensome requirements were in various ways evaded or transgressed; and the crowding of the burgesses of Latin townships to Rome, and the complaints of their magistrates as to the increasing depopulation of the cities and the impossibility under such circumstances of furnishing the fixed contingent, led the Roman government to institute police-ejections from the capital on a large scale (567, 577). The measure might be unavoidable, but it was none the less severely felt.
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Reference address : https://www.ellopos.net/elpenor/rome/3-11-government-governed.asp?pg=33