The Best Of The Intruders BY The Intruders - The Intruders are an American soul music group most popular in the 1960s and 1970s.[1] As one of the first groups to have hit songs under the direction of Kenny Gamble and Leon Huff, they were a major influence on the development of Philadelphia soul. The Intruders are also noted for having 24 R&B chart hits, including 6 R&B Top Tens, and 14 chart hits in the Billboard Hot 100, including their signature song, the million-selling Top 10 smash, "Cowboys to Girls."