You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
American_Broadcasting_Company

Context:
During the 1960s, ABC continued on the same path that it began to take in the mid-1950s, by consolidating the network as part of its effort to gain loyalty from the public. The network's finances improved and allowed it to invest in other properties and programming. In May 1960, ABC purchased Chicago radio station WLS, which had shared airtime with WENR since the 1920s. This acquisition allowed ABC to consolidate its presence in the market. On May 9, 1960, WLS launched a new lineup consisting of ABC Radio programming. In 1960, Canadian entrepreneur John Bassett, who was trying to establish a television station in Toronto, sought the help of ABC to launch the station. Leonard Goldenson agreed to acquire a 25% interest in CFTO-TV; however, legislation by the Canadian Radio-Television Commission prohibited ABC's involvement, resulting in the company withdrawing from the project before the station's launch.

Question:
What radio station did ABC purchase in May 1960?

WLS