Rashi on Bereshis 48:22 explains מִיַּד הָאֱמֹרִי as follows
מיד עשו שעשה מעשה אמורי
The pasuk earlier in Bereshis (15:16) implies that the Emorites were sinners
כִּי לֹא שָׁלֵם עֲוֹן הָאֱמֹרִי עַד הֵנָּה
I would like to know exactly what was the sin/iniquity of the Emorite people specifically?