Question

the crowds insulted robinson.
some of his own teammates refused to play with him.
and or ← joining words
combine the sentences into one sentence. use one of the joining words.

Explanation:

The two sentences describe related, sequential negative events involving Robinson, so "and" is the appropriate coordinating conjunction to connect them, as it links similar, connected statements.

Answer:

The crowds insulted Robinson, and some of his own teammates refused to play with him.