They become very revengeful and aggressive if you have ever disturbed their nest. When I was young I just threw a small stone at one of the nests near my home (for fun not to harm). From then on, for several years, they seem to recognize me everytime I go out of the house and call their gang to swoop on me. I stopped going to my terrace just because of that. After may be 10+ years or so it stopped.

Later I was stunned to read that Crows remember your face and can communicate your face to other Crows[1]. Thats how they can detect you for several miles in radius.

[1] https://theconversation.com/never-cross-a-crow-it-will-remem...