Jamieson, Fausset and Brown on Hebrews 10:33

33. The persecutions here referred to seem to have been endured by the Hebrew Christians at their first conversion, not only in Palestine, but also in Rome and elsewhere, the Jews in every city inciting the populace and the Roman authorities against Christians.

gazing-stock--as in a theater (so the Greek): often used as the place of punishment in the presence of the assembled multitudes. Ac 19:29; 1Co 4:9, "Made a theatrical spectacle to the world."

ye became--of your own accord: attesting your Christian sympathy with your suffering brethren.

companions of--sharers in affliction with.