The buses were surrounded by an angry crowd,which were already full.

[嘟嘟嘟嘟]

The buses were surrounded by an angry crowd,which were already full.
Is the sentence right in grammar? Here 'which' refers to 'the buses' that is rather far in position.

 

[jutfrank]

No, it isn't right.

If you move the relative clause to a different place in the sentence, it'll be much better.

 

[Charlie Bernstein]

It says the crowd were full, which (a) isn't grammatical and (b) doesn't make sense.