Here is a much higher quality and much less cropped version of this image. Here is the source. Per there:

> Parents march in support of LGBTQ rights at Gay Pride parade in Greenwich Village, New York City, US, 30th June 1974; (right) is American lawyer Dick Ashworth marching with a sign that reads 'I'm Proud of My Gay Son'. He later became one of the founding members of PFLAG (Parents, Families, and Friends of Lesbians and Gays). (Photo by Bettmann via Getty Images)