In-laws harassing and trying to break marriage what can i do

Hi,.i got married in December 2013 it's a love marriage with both the parents concern it went well I live in USA .i stayed at my in laws place for one month for whole they used bad words to me after coming USA in June 2014 my father expired so my in laws did not allowed me to go india that I did not gave dowry but finally after pleasing my husband allowed me for my father 11 day after gng to india my mother in law call me and used a very bad words in phone since I returned to USA the day I stopped speaking to them now it's been 2 years they were using bad words to my mom and my sister Even speaking bad about me in my husbands family my sister in law lives here in USA whenever she visits my house and she call my husband she always force my husband to leave me and remarry again in 2015 July my in laws came to my house they stayed for 15 days in my house while those 15 days they fought with me everyday they agreed that they are trying to separate me from my husband