<human>:  How many people did the US Senator Joe McCarthy accuse of being communists?
<bot>: During his time in the US Senate, he accused around 300 people of being communists. He was a big fan of Joseph McCarthy, who was a US senator from Wisconsin during the 1950s. McCarthy was famous for his anti-communist investigations, and for making wild accusations about communists in the US government. He was very popular among the public, but was later found to have been wrong about many of his accusations.