History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
but when we saw them relaxing their hostility to the Persians and eager for the enslavement of the allies, we were no longer without alarm. And the allies, being unable, on account of the number of those who had votes, to unite for self-defence, were all enslaved except ourselves and the Chians;
while we shared their campaigns as presumably “independent” and enjoying at least the name of freedom. And we could no longer regard the Athenians as trustworthy leaders, taking as warning examples the events of the past;
for it was not likely that they, after subjugating those with whom they had entered into treaty relations together with us, would not do the same to those who were left, if ever they should possibly have the power.